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Colored diff for /texts/archimedes/xml/Attic/stevi_weegc_01_nl_1586.xml between version 1.77 and 1.101

version 1.77, 2003/09/09 19:37:30

version 1.101, 2003/09/10 18:44:29

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<cvs_file>stevi_weegc_01_nl_1586</cvs_file>

<cvs_version/>

</info> <text> <front> </front> <body> <chap>

</info> <text> <front> </front> <body>

<chap>

<pb/><s>NOT_TRANSCRIBED</s>

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<s> <emph type="other"/>EINDE DES EERSTEN BOVCX<emph.end/>. </s>

<s> <emph type="other"/>EINDE DES EERSTEN BOVCK<emph.end/>. </s>

<s><emph type="other"/>HET<emph.end/> <emph type="other"/>TWEEDE<emph.end/> <emph type="other"/>BOVCK<emph.end/></s>

<s><emph type="other"/>HET TWEEDE BOVCK <lb/>

<s> <emph type="other"/>VANDEBEGHINSELEN<emph.end/> <arrow.to.target n="marg166"/></s>

<s>

<margin.target id="marg166"/>Elementis.

</s>

<s> <emph type="other"/>DERWEEGHCONST<emph.end/>, <emph type="other"/>DWELCKIS<emph.end/></s>

VANDE BEGHINSELEN <arrow.to.target n="marg166"/><lb/>

DER WEEGHCONST, DWELCK IS <lb/>

VANDE VINDING DER SWAER<lb/>

HEYDTS MIDDELPVNTEN, <lb/>

Beschreuen door Simon Steuin.<emph.end/> </s>

<s> <emph type="other"/>VANDEVINDINGDERSWAER<emph.end/><lb/></s>

<s> <emph type="other"/>HEYDTSMIDDELPVNTEN<emph.end/> ,</s>

<s>

<margin.target id="marg167"/>eschreuen door Simon Steuin.

<margin.target id="marg166"/>Elementis.

</s>

<s> <emph type="other"/>WY<emph.end/> hebben in t'eerste bouck tot het beschriuen der wichtighe ghedaenten, ghenomen een pilaer (voldoende aldaer het voornemen) diens swaerheyts middelpunt door ghemeene wetenschap bekent is, maer in veel ander lichamen en ghebueret niet also; wel is waer dattet door een corte ghemeene reghel in allen werckelick te vinden is, so door t'eerste voorstel der <arrow.to.target n="marg168"/> blijcken sal, maer met de Wisconstighe <arrow.to.target n="marg169"/> vinding ist anders ghestelt; Daer af heeft eerst gheschreuen Archimedes in platten, ende naer hem Frederic Commandin in lichamen: Wy sullen tottet een en t'ander (ouermits het een afcoemst <arrow.to.target n="marg170"/> van beghinselen is, byde voorgaende wel dienende, ende tottet volghende, so wel <emph type="other"/>WATERWICHT<emph.end/>, als <emph type="other"/>WEEGHDAET<emph.end/>, seer noodich) het onse voughen, ende alles naer onse oirden verspreyden, daer af beschrijuende der Beghinselen tweede bouck. </s>

<s> Y hebben in t'eerste bouck tot het beschriuen der wichtighe ghedaenten, ghenomen een pilaer (voldoende aldaer het voornemen) diens swaerheyts middelpunt door ghemeene wetenschap bekent is, maer in veel ander lichamen en ghebueret niet also; wel is waer dattet door een corte ghemeene reghel in allen werckelick te vinden is, so door t'eerste voorstel der <arrow.to.target n="marg168"/> blijcken sal, maer met de Wisconstighe <arrow.to.target n="marg169"/> vinding ist anders ghestelt; Daer af heeft eerst gheschreuen Archimedes in platten, ende naer hem Frederic Commandin in lichamen: Wy sullen tottet een en t'ander (ouermits het een afcoemst <arrow.to.target n="marg170"/> van beghinselen is, byde voorgaende wel dienende, ende tottet volghende, so wel WATERWICHT, als WEEGHDAET, seer noodich) het onse voughen, ende alles naer onse oirden verspreyden, daer af beschrijuende der Beghinselen tweede bouck. </s><s>Wat de bepalinghen <arrow.to.target n="marg171"/> belangt vande Meetconstighe formen, die bygheualle hier yemandt begheeren mocht, wy nemen die door t'ghestelde <arrow.to.target n="marg172"/> voor bekent uyt de Meetconst <arrow.to.target n="marg173"/>; Alleenelick dit daer af segghende, dat wy t'woort <arrow.to.target n="marg174"/>, ofte <arrow.to.target n="marg175"/>, beteeckenen met <arrow.to.target n="marg176"/>: Ende <arrow.to.target n="marg177"/>, met <arrow.to.target n="marg178"/>; Reden, dat dier formen daet <arrow.to.target n="marg179"/> voornamelicxt bestaet int ontsteken ofte branden.</s>

<s>

<margin.target id="marg168"/>Praxis.

<margin.target id="marg169"/>Mathematica.

<margin.target id="marg170"/>Species.

</s>

<s>Wat de bepalinghen <arrow.to.target n="marg171"/> belangt vande Meetconstighe formen, die bygheualle hier yemandt begheeren mocht, wy nemen die door t'ghestelde <arrow.to.target n="marg172"/> voor bekent uyt de Meetconst <arrow.to.target n="marg173"/>; Alleenelick dit daer af segghende, dat wy t'woort <emph type="italics"/>Parabola<emph.end/>, ofte <emph type="italics"/>Rectanguli coni sectio<emph.end/>, beteeckenen met <emph type="italics"/>Brantsne<emph.end/>: Ende <emph type="italics"/>Conoidale Rectangulum<emph.end/>, met <emph type="italics"/>Brander<emph.end/>; Reden, dat dier formen daet <arrow.to.target n="marg179"/> voornamelicxt bestaet int ontsteken ofte branden.</s>

<s>

<margin.target id="marg171"/>Definitiones.

<margin.target id="marg172"/>Per hypothesin.

<margin.target id="marg173"/>Geometria.

<margin.target id="marg174"/>Parabola

<margin.target id="marg175"/>Rectanguli coni sectio

<margin.target id="marg176"/>Brantsne

<margin.target id="marg177"/>Conoidale Rectangulum

<margin.target id="marg178"/>Brander

<margin.target id="marg179"/>Effectus.

</s>

<s><emph type="other"/>EERST VANDE VINDING DER <lb/>

SWAERHEYTS MIDDELPVNTEN <lb/>

VANDE PLATTEN.<emph.end/> </s><s><arrow.to.target n="marg180"/> </s>

<s><emph type="other"/>EERSTVANDEVINDINGDER<emph.end/></s>

<s> <emph type="other"/>SWAERHEYTSMIDDELPVNTEN<emph.end/> </s>

<s> <emph type="other"/>VANDEPLATTEN<emph.end/>. </s><s><arrow.to.target n="marg180"/> </s>

<s>

<margin.target id="marg180"/>Planis.

</s>

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<s><emph type="other"/>BY<emph.end/> aldien de platten eenich ghewicht hadden, ende datmen toeliete die te wesen inde reden haerder grootheden, wy souden eyghentlick mueghen spreken van haer Swaerheydt, Swaerheyts middelpunt, Swaerheyts middellini, &c. Maer <pb pagenum="66"/>anghesien in t'plat gheen ghewicht en is, soo en isser eyghentlick sprekende gheen Swaerheydt, Swaerheydts middelpunt, noch Swaerheyts middellini in; Daerom moetmen dit alles <arrow.to.target n="marg183"/>lijckspreucklick verstaen, ende nemen als door t'ghestelde, dat der platten ghewichten inde reden haerder grootheden sijn, want T'valsche wort toeghelaten, op datmen t'waerachtighe daer duer leere.

<s>

<margin.target id="marg181"/>aldien de platten eenich ghewicht hadden, ende datmen toeliete die te wesen inde reden haerder grootheden, wy souden eyghentlick mueghen spreken van haer Swaerheydt, Swaerheyts middelpunt, Swaerheyts middellini, &c.

</s>

<s><arrow.to.target n="marg182"/>{Metaphoricè.}<arrow.to.target n="marg183"/> T'valsche wort toeghelaten, op datmen t'waerachtighe daer duer leere. </s>

<s>

<margin.target id="marg182"/>Maer anghesien in t'plat gheen ghewicht en is, soo en isser eyghentlick sprekende gheen Swaerheydt, Swaerheydts middelpunt, noch Swaerheyts middellini in; Daerom moetmen dit alles lijckspreucklick

<margin.target id="marg183"/>Metaphoricè.

<margin.target id="marg183"/> verstaen, ende nemen als door t'ghestelde, dat der platten ghewichten inde reden haerder grootheden sijn, want

</s>

<s><emph type="other"/>I. VERTOOCH<emph.end/>. <emph type="other"/>I. VOORSTEL<emph.end/>. </s>

<s>I. <emph type="other"/>VERTOOCH<emph.end/>. I. <emph type="other"/>VOORSTEL<emph.end/>. </s>

<s> <emph type="other"/>YDER<emph.end/> plats middelpunt der form, is oock sijn swaerheyts middelpunt. </s>

<s><emph type="other"/>IVOORBEELT<emph.end/>.</s>

<s><emph type="other"/>I. VOORBEELT<emph.end/>.</s>

<s> <emph type="other"/>T'GHEGHEVEN<emph.end/>. </s><s>Laet ABC een euesijdich driehouck wesen, diens formens middelpunt sy D. </s><s><emph type="other"/>T'BEGHEERDE<emph.end/>. </s><s>Wy moeten bewysen dat D oock het swaerheyts middelpunt is des driehoucx ABC. </s><s><emph type="other"/>T'BEREYTSEL<emph.end/>. </s><s>Laet ghetrocken worden van A tot int middel van BC, de lini AE, sghelijcx van C tot int middel van AB, de lini CF. </s><s> <emph type="other"/>T'BEWYS<emph.end/>. </s><s>Wesende de driehouck ABC opghehanghen byde lini AE, het deel AEC sal euewichtich hanghen teghen AEB, want sy sijn euen groot, ghelijck, ende van ghelijcker ghestalt; AE dan is swaerheyts middellini des driehoucx ABC, Ende om de selue reden sal FC oock des driehoucx swaerheyts middellini sijn, maer dese snien malcanderen in des formens middelpunt D, ende elck dier linien heeft in haer het swaerheyts middelpunt, tis dan D.</s>

<s><emph type="other"/>IIVOORBEELT<emph.end/>.</s>

<s><emph type="other"/>II. VOORBEELT<emph.end/>.</s>

<s> <emph type="other"/>T'BEREYTSEL<emph.end/>. </s><s>Laet ghetrocken worden FG, tusschen de middelpunten van AD ende BC, insghelijcx HI, tusschen de middelpunten van AB ende DC. </s><s> <emph type="other"/>T'BEWYS<emph.end/>. </s><s>Wesende den vierhouck opghehanghen byde lini HI, Het deel HIDA sal euewichtich hanghen teghen HICB, want sy sijn euegroot ghelijck ende van ghelijcker ghestalt; HI dan is swaer<pb pagenum="67"/>heyts middellini des vierhoucx ABCD, Ende om de selue reden sal FG oock des vierhoucx swaerehyts middellini sijn, maer dese doorsnien malcanderen in E, ende elck dier linien heeft in haer het swaerheyts middelpunt, tis dan E.</s>

<s> <emph type="other"/>T'GHEGHEVEN<emph.end/>. </s><s>Laet ABCD een euewydich vierhouck sijn, diens formens middelpunt E. </s><s><emph type="other"/>T'BEGHEERDE<emph.end/>. </s><s>Wy moeten bewysen dat E oock het swaerheyts middelpunt is.</s><s> <emph type="other"/>T'BEREYTSEL<emph.end/>. </s><s>Laet ghetrocken worden FG, tusschen de middelpunten van AD ende BC, insghelijcx HI, tusschen de middelpunten van AB ende DC. </s>

<s><emph type="other"/>IIIVOORBEELT<emph.end/>.</s>

<s> <emph type="other"/>T'BEWYS<emph.end/>. </s><s>Wesende den vierhouck opghehanghen byde lini HI, Het deel HIDA sal euewichtich hanghen teghen HICB, want sy sijn euegroot ghelijck ende van ghelijcker ghestalt; HI dan is swaer<pb pagenum="67"/>heyts middellini des vierhoucx ABCD, Ende om de selue reden sal FG oock des vierhoucx swaerehyts middellini sijn, maer dese doorsnien malcanderen in E, ende elck dier linien heeft in haer het swaerheyts middelpunt, tis dan E.</s>

<s> <emph type="other"/>T'GHEGHEVEN<emph.end/>. </s><s>Laet ABCD een gheschickt ofte inschriuelick vijfhouck wesen, diens formens middelpunt F sy. </s><s><emph type="other"/>T'BEGHEERDE<emph.end/>. </s><s>Wy moeten bewysen dat F oock het swaerheyts middelpunt is. </s><s><emph type="other"/>T'BEREYTSEL<emph.end/>. </s><s>Laet ghetrocken worden van A tot int middel van DC, de lini AG; sghelijcx van B tot int middel van ED, de lini BH. </s><s><emph type="other"/>T'BEWYS<emph.end/>. </s><s>Wesende den vijfhouck opghehanghen byde lini AG, het deel AGDE sal euewichtich hanghen teghen het deel AGCB, want sy sijn euegroot, ghelijck, ende van ghelijcker ghestalt: AG dan is swaerheyts middellini des vijfhoucx, ende om de selue reden sal BH oock des selfden vijfhoucx swaerehyts middellini wesen; maer dese doorsnien malcanderen in des formens middelpunt F, ende elck dier linien heeft in haer het swaerheyts middelpunt, tis dan F. </s><s> Sghelijcx sal oock t'bewys sijn in allen anderen hebbende een formens middelpunt als Seshoucken, Ronden, Scheefronden, &c. </s><s><emph type="other"/>T'BESLVYT<emph.end/>. </s><s>Yder plats middelpunt der form dan, is oock sijn swaerheyts middelpunt, t'welck wy bewysen moesten.</s>

<s><emph type="other"/>III. VOORBEELT<emph.end/>.</s>

<s><emph type="other"/>II. VERTOOCH. II. VOORSTEL<emph.end/>.</s>

<s> <emph type="other"/>YDER<emph.end/> driehoucx swaerheydts middelpunt, is inde lini ghetrocken vanden houck tot int middel der sijde. </s>

<s><emph type="other"/>T'BEREYTSEL<emph.end/>. </s><s>Laet ghetrocken worden van A tot int middel van DC, de lini AG; sghelijcx van B tot int middel van ED, de lini BH. </s><s><emph type="other"/>T'BEWYS<emph.end/>. </s><s>Wesende den vijfhouck opghehanghen byde lini AG, het deel AGDE sal euewichtich hanghen teghen het deel AGCB, want sy sijn euegroot, ghelijck, ende van ghelijcker ghestalt: AG dan is swaerheyts middellini des vijfhoucx, ende om de selue reden sal BH oock des selfden vijfhoucx swaerehyts middellini wesen; maer dese doorsnien malcanderen in des formens middelpunt F, ende elck dier linien heeft in haer het swaerheyts middelpunt, tis dan F. </s><s> Sghelijcx sal oock t'bewys sijn in allen anderen hebbende een formens middelpunt als Seshoucken, Ronden, Scheefronden, &c. </s>

<s><emph type="other"/>T'BESLVYT<emph.end/>. </s><s>Yder plats middelpunt der form dan, is oock sijn swaerheyts middelpunt, t'welck wy bewysen moesten.</s>

<s> <emph type="other"/>T'BEGHEERDE<emph.end/>. </s><s>Wy moeten bewysen dat des driehoucx swaerheyts middelpunt inde lini AD is. </s><s><emph type="other"/>T'BEREYTSEL<emph.end/>. </s><s>Laet ons trecken EF, GH, IK, euewydighe van BC, sniende AD in L, M, N, daer naer EO, GP, IQ, KR, HS, FT, euewydighe met AD. </s><s><emph type="other"/>T'BEWYS<emph.end/>. </s><s>Ouermits EF euewydighe is van BC, ende EO, FT met LD, soo sal EFTO, euewydich vierhouck sijn, wiens EL euen is met LF, oock met OD ende DT, waer duer het swaerheyts middelpunt des vierhoucx EFTO in DL is, duer het I voorstel deses boucx. </s><s>Ende om de selue reden sal het swaerheyts middelpunt des euewydichs vierhoucx GHSP wesen in LM, ende van IKRQ in MN, ende vervolghens het swaerheyts middelpunt der form IKRHSFTOEPGQ ghemaect vande voornoemde drie vierhoucken, sal wesen inde lini ND, ofte AD. </s><s> Nu ghelijck hier in beschreuen sijn drie vierhoucken, also canmender oneindelicke sulcke vierhoucken in beschrijuen, ende des binneschreuens formen swaerheyts middelpunt, sal altijt sijn (om de redenen als vooren) inde lini AD. </s><s>Maer hoe datter sulcke vierhoucken meer sijn, hoe dat den driehouck ABC min verschilt vande binneschreuen form der vierhoucken; want treckende linien euewydich van BC door de middelen van AN, NM, ML, LD, t'verschil des laetsten ghestalts, sal effen den helft sijn van t'verschil des voorgaenden ghestalts. </s><s>Wy connen dan door dat oneindelick naerderen sulck een form binnen den driehouck stellen, dattet verschil tusschen haer ende den driehouck, minder sal wesen dan eenich ghegheuen plat hoe cleen het sy: Waer uyt volght, dat stellende AD als swaerheydts middellini, so sal t'staltwicht des deels ADC, min verschillen van t'staltwicht des deels ADB, dan eenich plat datmen soude connen gheuen hoe cleen het sy, waer uyt ick aldus . </s><s> Daerom AD is swaerheyts middellini, ende vervolghens t'swaerheyts middelpunt des driehoucx ABC is in haer. </s><s><emph type="other"/>T'BESLVYT<emph.end/>. </s><s>Yder driehoucx swaerheydts middelpunt dan is inde lini ghetrocken vanden houck tot int middel der sijde, t'welck wy bewysen moesten. </s><s> </s>

<s><emph type="other"/>II. VERTOOCH<emph.end/>. <emph type="other"/>II. VOORSTEL<emph.end/>.</s>

<s> <emph type="other"/>YDER<emph.end/> driehoucx swaerheydts middelpunt, is inde lini ghetrocken vanden houck tot int middel der sijde. </s>

<s>

<margin.target id="marg184"/>Neuen alle verschillende staltswaerheden, can een swaerheydt ghestelt worden minder dan haer verschil

<margin.target id="marg185"/>Neuen dese staltswaerheden ADC ende ADB, en can gheen swaerheydt ghestelt worden minder dan haer verschil

<margin.target id="marg186"/>Dese staltswaerheden dan ADC ende ADB en verschillen niet

</s>

<s> <emph type="other"/>T'GHEGHEVEN<emph.end/>. </s><s>Laet ABC een driehouck sijn van form soot <pb pagenum="68"/>valt, waer in vanden houck A tot in D middel vande sijde BC, ghetrocken is de lini AD. </s><s> <emph type="other"/>T'BEGHEERDE<emph.end/>. </s><s>Wy moeten bewysen dat des driehoucx swaerheyts middelpunt inde lini AD is. </s><s><emph type="other"/>T'BEREYTSEL<emph.end/>. </s><s>Laet ons trecken EF, GH, IK, euewydighe van BC, sniende AD in L, M, N, daer naer EO, GP, IQ, KR, HS, FT, euewydighe met AD. </s>

<s><emph type="other"/>T'BEWYS<emph.end/>. </s><s>Ouermits EF euewydighe is van BC, ende EO, FT met LD, soo sal EFTO, euewydich vierhouck sijn, wiens EL euen is met LF, oock met OD ende DT, waer duer het swaerheyts middelpunt des vierhoucx EFTO in DL is, duer het I voorstel deses boucx. </s><s>Ende om de selue reden sal het swaerheyts middelpunt des euewydichs vierhoucx GHSP wesen in LM, ende van IKRQ in MN, ende vervolghens het swaerheyts middelpunt der form IKRHSFTOEPGQ ghemaect vande voornoemde drie vierhoucken, sal wesen inde lini ND, ofte AD. </s><s> Nu ghelijck hier in beschreuen sijn drie vierhoucken, also canmender oneindelicke sulcke vierhoucken in beschrijuen, ende des binneschreuens formen swaerheyts middelpunt, sal altijt sijn (om de redenen als vooren) inde lini AD. </s><s>Maer hoe datter sulcke vierhoucken meer sijn, hoe dat den driehouck ABC min verschilt vande binneschreuen form der vierhoucken; want treckende linien euewydich van BC door de middelen van AN, NM, ML, LD, t'verschil des laetsten ghestalts, sal effen den helft sijn van t'verschil des voorgaenden ghestalts. </s><s>Wy connen dan door dat oneindelick naerderen sulck een form binnen den driehouck stellen, dattet verschil tusschen haer ende den driehouck, minder sal wesen dan eenich ghegheuen plat hoe cleen het sy: Waer uyt volght, dat stellende AD als swaerheydts middellini, so sal t'staltwicht des deels ADC, min verschillen van t'staltwicht des deels ADB, dan eenich plat datmen soude connen gheuen hoe cleen het sy, waer uyt ick aldus strie. </s>

<s> A. Neuen alle verschillende staltswaerheden, can een swaerheydt ghestelt worden minder dan haer verschil;</s>

<s>O. Neuen dese staltswaerheden ADC ende ADB, en can gheen swaerheydt ghestelt worden minder dan haer verschil;</s>

<s>O. Dese staltswaerheden dan ADC ende ADB en verschillen niet</s>

<s> Daerom AD is swaerheyts middellini, ende vervolghens t'swaerheyts middelpunt des driehoucx ABC is in haer. </s><s><emph type="other"/>T'BESLVYT<emph.end/>. </s><s>Yder driehoucx swaerheydts middelpunt dan is inde lini ghetrocken vanden houck tot int middel der sijde, t'welck wy bewysen moesten. </s>

<s>I. <emph type="other"/>EYSCH. III. VOORSTEL<emph.end/>.</s>

<s><emph type="other"/>I. EYSCH<emph.end/>. <emph type="other"/>III. VOORSTEL<emph.end/>.</s>

<s> <emph type="other"/>WESENDE<emph.end/> ghegheuen een driehouck: Sijn swaerheyts middelpunt te vinden. </s>

<s> <emph type="other"/>T'GHEGHEVEN<emph.end/>. </s><s>Laet ABC een driehouck wesen. </s><s><emph type="other"/>T'BEGHEERDE<emph.end/>. </s><s>Wy moeten sijn swaerheytds middelpunt vinden. </s><s> <emph type="other"/>T'WERCK<emph.end/>. </s><s>Men sal van A tot int middel van BC, trecken de lini AD, sghelijcx van C tot int middel van AB, de lini CE, sniende AD in F: Ick seg dat F t'begheerde swaerheydts middelpunt is. </s><s><emph type="other"/>T'BEWYS<emph.end/>. </s><s>T'swaerheyts middelpunt des driehoucx ABC, is inde lini AD, ende oock in CE, duer het 2 voorstel, tis dan F, t'welck wy bewysen moesten. </s><s><emph type="other"/>T'BESLVYT<emph.end/>. </s><s>Wesende dan ghegheuen een driehouck: Wy hebben sijn swaerheydts middelpunt gheuonden naer den eysch.</s>

<s><emph type="other"/>III. VERTOOCH. IIII. VOORSTEL<emph.end/>.</s>

<s><emph type="other"/>III. VERTOOCH<emph.end/>. <emph type="other"/>IIII. VOORSTEL<emph.end/>.</s>

<s> <emph type="other"/>HET<emph.end/> swaerheydts middelpunt eens driehoucx deelt de lini vanden houck tot int middel der sijde alsoo, dattet stick naer den houck, dobbel is an t'ander. </s>

<s> <emph type="other"/>T'GHEGHEVEN<emph.end/>. </s><s>Laet ABC een driehouck sijn, ende vanden houck B een lini ghetrocken worden tot D int middel van AC, sghelicx van C tot E int middel van AB, sniende BD in F voor swaerheyts middelpunt des driehoucx ABC. </s><s><emph type="other"/>T'BEGHEERDE<emph.end/>. </s><s>Wy moeten bewysen dat CF dobbel is an FE. </s><s><emph type="other"/>T'BEWYS<emph.end/>. </s><s>Ghetrocken de reden E<emph type="other"/>BI<emph.end/> tot BA 2, vande reden C<emph type="other"/>DI<emph.end/> tot D<emph type="other"/>AI<emph.end/> (dat is <arrow.to.target n="marg187"/> I/2 van <arrow.to.target n="marg188"/> I/I) <arrow.to.target n="marg189"/> daer rest de reden van CF tot FE, maer treckende <arrow.to.target n="marg190"/> I/2 van <arrow.to.target n="marg191"/> I/I daer blijft <arrow.to.target n="marg192"/> 2/I. </s><s>CF dan is tot FE, als van 2 tot I. </s><s><emph type="other"/>T'BESLVYT<emph.end/>. </s><s>Het swaerheyts middelpunt dan eens driehoucx deelt de lini vande houck tot int middel der sijde alsoo, dattet stick naer den houck dobbel is an t'ander. </s><s>t'welck wy bewysen moesten.</s>

<s><emph type="other"/>T'BESLVYT<emph.end/>. </s><s>Het swaerheyts middelpunt dan eens driehoucx deelt de lini vande houck tot int middel der sijde alsoo, dattet stick naer den houck dobbel is an t'ander. </s><s>t'welck wy bewysen moesten.</s>

<s>

<margin.target id="marg187"/>Reden

<margin.target id="marg188"/>Reden

<margin.target id="marg189"/>Door t'verkeerde des I2 cap. I lib. Almag. Ptolem.

<margin.target id="marg190"/>Reden

<margin.target id="marg191"/>Reden

<margin.target id="marg192"/>Reden

</s>

<s><emph type="other"/>IIII. VERTOOCH<emph.end/>. V. <emph type="other"/>VOORSTEL<emph.end/>.</s>

<s><emph type="other"/>IIII. VERTOOCH<emph.end/>. <emph type="other"/>V. VOORSTEL<emph.end/>.</s>

<s> <emph type="other"/>WESENDE<emph.end/> twee sijden eens driehoucx elck ghedeelt in drie euen deelen: De lini tusschen de twee punten der deeling naest de derde sijde, streckt door des driehoucx swaerheyts middelpunt. </s>

<s> <emph type="other"/>T'GHEGHEVEN<emph.end/>. </s><s>Laet ABC een driehouck wesen, van t'welck yder sijde AB ende BC ghedeelt sy in drie euen deelen, met de punten D, E, F, G, ende tusschen de punten E, G, naest de derde sijde BC, sy ghetrocken de lini EG. </s><s><emph type="other"/>T'BEGHEERDE<emph.end/>. </s><s>Wy moeten bewysen dat EG duer des driehoucx ABC swaerheyts middelpunt streckt <emph type="other"/>T'BEREYTSEL<emph.end/>. </s><s>Laet ons trecken van A tot int middel van BC, de lini AH, sniende EG in I. </s><s><emph type="other"/>T'BEWYS<emph.end/>. </s><s>Ouermits <arrow.to.target n="marg193"/> AE sulcken reden heeft tot EB, als AG tot GC, soo is EG euewydighe met BC, ende veruolghens EI is euewydighe met BH, daerom ghelijck AE tot EB, alsoo AI tot IH, maer AE is dobbel tot EB door t'ghegheuen, daerom AI is dobbel tot IH, maer wesende AI dobbel tot IH, soo is I t'swaerheyts middelpunt des driehoucx ABC door het 4 voorstel, daerom EG streckt door des ghegheuen driehoucx swaerheyts middelpunt. </s><s><emph type="other"/>T'BESLVYT<emph.end/>. </s><s>Wesende dan twee sijden eens driehoucx elck ghedeelt in drie euen deelen, de lini tusschen de twee punten der deeling naest de derde sijde, streckt door des driehoucx swaerheyts middelpunt, t'welck wy bewysen moesten. </s>

<s><emph type="other"/>T'BEREYTSEL<emph.end/>. </s><s>Laet ons trecken van A tot int middel van BC, de lini AH, sniende EG in I. </s><s><emph type="other"/>T'BEWYS<emph.end/>. </s><s>Ouermits <arrow.to.target n="marg193"/> AE sulcken reden heeft tot EB, als AG tot GC, soo is EG euewydighe met BC, ende veruolghens EI is euewydighe met BH, daerom ghelijck AE tot EB, alsoo AI tot IH, maer AE is dobbel tot EB door t'ghegheuen, daerom AI is dobbel tot IH, maer wesende AI dobbel tot IH, soo is I t'swaerheyts middelpunt des driehoucx ABC door het 4 voorstel, daerom EG streckt door des ghegheuen driehoucx swaerheyts middelpunt. </s><s><emph type="other"/>T'BESLVYT<emph.end/>. </s><s>Wesende dan twee sijden eens driehoucx elck ghedeelt in drie euen deelen, de lini tusschen de twee punten der deeling naest de derde sijde, streckt door des driehoucx swaerheyts middelpunt, t'welck wy bewysen moesten. </s>

<s>

<margin.target id="marg193"/>2. v. 6. B. E.

</s>

<s><emph type="other"/>II. EYSCH<emph.end/>. <emph type="other"/>VI. VOORSTEL<emph.end/>.</s>

<s><emph type="other"/>II. EYSCH. VI. VOORSTEL<emph.end/>.</s>

<s> <emph type="other"/>WESENDE<emph.end/> ghegheuen een rechtlinich plat <arrow.to.target n="marg194"/>: Sijn swaerheyts middelpunt te vinden. </s>

<s>

Line 1705

Line 1643

<s><emph type="other"/>IVOORBEELT<emph.end/>.</s>

<s><emph type="other"/>I. VOORBEELT<emph.end/>.</s>

<s> <emph type="other"/>T'GHEGHEVEN<emph.end/>. </s><s>Laet ABCD een ongheschict vierhouck wesen. </s><s><emph type="other"/>T'BEGHEERDE<emph.end/>. </s><s>Wy moeten sijn swaerheyts middelpunt vinden.</s>

Line 1720

Line 1658

<s><emph type="other"/>IIVOORBEELT<emph.end/>.</s>

<s><emph type="other"/>II. VOORBEELT<emph.end/>.</s>

<s> <emph type="other"/>T'GHEGHEVEN<emph.end/>. </s><s>Laet ABCDE een ongheschickt vijfhouck sijn. </s>

<s> <emph type="other"/>T'GHEGHEVEN<emph.end/>. </s><s>Laet ABCDE een ongheschickt vijfhouck sijn. </s><s><emph type="other"/>T'BEGHEERDE<emph.end/>. </s><s>Wy moeten sijn swaerheyts middelpunt vinden. </s><s><emph type="other"/>T'WERCK<emph.end/>. </s><s>Men sal trecken AC, ende vinden t'swaerheyts middelpunt des driehoucx ACB door het 3 voorstel, t'welck F sy, ende vanden vierhouck ACDE duer t'voorgaende I voorbeelt, t'welck G sy, ende de lini FG sal balck wesen, daer naer salmen maken twee euewydighe vierhoucken van een selfde hoochde, als HIKL euen anden vierhouck ACDE, ende HIMN euen anden driehouck ACB, deelende den balck GF in O, alsoo dat den erm OF, sulcken reden hebbe tot den erm OG, als IK tot IM; Ick seg dat O t'begheerde swaerheyts middelpunt is.</s>

<s><emph type="other"/>T'BEGHEERDE<emph.end/>. </s><s>Wy moeten sijn swaerheyts middelpunt vinden. </s>

<s><emph type="other"/>IIIVOORBEELT<emph.end/>.</s>

<s><emph type="other"/>T'WERCK<emph.end/>. </s><s>Men sal trecken AC, ende vinden t'swaerheyts middelpunt des driehoucx ACB door het 3 voorstel, t'welck F sy, ende vanden vierhouck ACDE duer t'voorgaende I voorbeelt, t'welck G sy, ende de lini FG sal balck wesen, daer naer salmen maken twee euewydighe vierhoucken van een selfde hoochde, als HIKL euen anden vierhouck ACDE, ende HIMN euen anden driehouck ACB, deelende den balck GF in O, alsoo dat den erm OF, sulcken reden hebbe tot den erm OG, als IK tot IM; Ick seg dat O t'begheerde swaerheyts middelpunt is.</s>

<s> <emph type="other"/>T'GHEGHEVEN<emph.end/>. </s><s>Laet ABCDEF een ongheschickt seshouck sijn. </s><s><emph type="other"/>T'BEGHEERDE<emph.end/>. </s><s>Wy moeten sijn swaerheyts middelpunt vinden. </s><s><emph type="other"/>T'WERCK<emph.end/>. </s><s>Men sal trecken AC, ende vinden t'swaerheydts middelpunt des driehoucx ACB duer het 3 voorstel, t'welck G sy, ende vanden vijfhouck ACDEF, duer het voorgaende 2 voorbeelt, t'welck H sy, ende de lini GH sal balck wesen. </s><s>Daer naer salmen maken twee euewydighe vierhoucken van een selfde hoochde, als IKLM, euen anden vijfhouck ACDEF, ende IKNO <pb pagenum="72"/>euen anden driehouck ACB, deelende den balck HG in P, alsoo dat den erm PG, sulcken reden hebbe tot den erm PH, als de lini KM tot KN; Ick seg dat P t'begheerde swaerheyts middelpunt is. </s><s>Welcke maniere van wercking in allen anderen veelsijdeghe platten ghelijck sal sijn ande voorgaende.</s>

<s><emph type="other"/>III. VOORBEELT<emph.end/>.</s>

<s><emph type="other"/>T'WERCK<emph.end/>. </s><s>Men sal trecken AC, ende vinden t'swaerheydts middelpunt des driehoucx ACB duer het 3 voorstel, t'welck G sy, ende vanden vijfhouck ACDEF, duer het voorgaende 2 voorbeelt, t'welck H sy, ende de lini GH sal balck wesen. </s><s>Daer naer salmen maken twee euewydighe vierhoucken van een selfde hoochde, als IKLM, euen anden vijfhouck ACDEF, ende IKNO <pb pagenum="72"/>euen anden driehouck ACB, deelende den balck HG in P, alsoo dat den erm PG, sulcken reden hebbe tot den erm PH, als de lini KM tot KN; Ick seg dat P t'begheerde swaerheyts middelpunt is. </s><s>Welcke maniere van wercking in allen anderen veelsijdeghe platten ghelijck sal sijn ande voorgaende.</s>

<s><emph type="other"/>MERCKT<emph.end/>.</s>

<s> Wy heben hier bouen voorbeelden beschreuen alwaer t'ghegheuen plat verkeert wort in euenhooghe ende euewydighe vierhoucken, wy connen t'selfde oock doen sonder soodanighe verkeering, daer af wy verscheyden voorbeelden beschrijuen sullen als volght.</s>

<s><emph type="other"/>IIIIVOORBEELT<emph.end/>.</s>

<s><emph type="other"/>IIII. VOORBEELT<emph.end/>.</s>

<s> <emph type="other"/>T'GHEGHEVEN<emph.end/>. </s><s>Laet ABCD een ongheschickt vierhouck wesen. </s><s><emph type="other"/>T'BEGHEERDE<emph.end/>. </s><s>Wy moeten sijn swaerheydts middelpunt vinden. </s><s><emph type="other"/>T'WERCK<emph.end/>. </s><s>Men sal den vierhouck deelen in twee driehoucken, met de lini AC, ende vinden t'swaerheydts middelpunt van elcken driehouck door het 3 voorstel, dat van ACB sy E, ende vanden driehouck ACD sy F, de lini dan EF is balck. </s><s>Daer naer salmen trecken DG ende BH, beyde rechthouckich op AC, deylende den balck FE en I, alsoo dat den erm IE, sulcken reden hebbe tot den erm IF, als DG tot BH; Ick seg dat I t'begheerde swaerheyts middelpunt is.</s>

<s><emph type="other"/>VVOORBEELT<emph.end/>. </s>

<s><emph type="other"/>V. VOORBEELT<emph.end/>. </s>

<s> <emph type="other"/>T'GHEGHEVEN<emph.end/>. </s><s>Laet ABCDE een ongheschickt vijfhouck sijn. </s><s><emph type="other"/>T'BEGHEERDE<emph.end/>. </s><s>Wy moeten sijn swaerheyts middelpunt vinden. </s><s><emph type="other"/>T'WERCK<emph.end/>. </s><s>Men sal den vijfhouck deelen in drie driehoucken, met eenighe linien als AD, AC, vindende daer naer het swaerheyts middelpunt des vierhoucx ACDE duer het 4 voorbeelt, t'welck F sy, ende des driehoucx ACB duer het 3 voorstel, t'welck G sy, ende de lini FG, is balck, Daer naer ghetrocken BH rechthouckich op AC; Ende CI met EK rechthouckich op AD, men sal der drie linien AD, AC, HB, vinden de vierde euerednighe <arrow.to.target n="marg197"/>, welcke sy LM, deelende den balck <arrow.to.target n="marg198"/> FG in N, alsoo dat den erm NG sulcken reden hebbe tot den erm NF, ghelijck CI met EK, tot LM; Ick seg dat N het begheerde swaerheydts middelpunt is.</s>

<s>

<margin.target id="marg197"/>Proportionalis.

<margin.target id="marg198"/>Door het I2. v. 6. B. E.

</s>

<s><emph type="other"/>VI. VOORBEELT.<emph.end/></s>

<s>VI. <emph type="other"/>VOORBEELT<emph.end/></s>

<s> <emph type="other"/>T'GHEGHEVEN<emph.end/>. Laet ABCDEF een ongheschickt seshouck sijn. <emph type="other"/>T'BEGHEERDE<emph.end/>. Wy moeten sijn swaerheydts middelpunt vinden.</s>

<s> <emph type="other"/>T'WERCK<emph.end/>.</s><s> Men sal den seshouck deelen in vier driehoucken, met eenighe linien als AC, AD, FD, vindende daer naer het swaerheyts middelpunt des vierhoucx ADCB door het 4. voorbeelt, t'welck G sy, ende des vierhoucx ADEF, t'welck H sy, ende de lini HG is balck. </s><s>Daernaer ghetrocken BI ende DK rechthouckich op AC, insghelijcx AL ende EM beyde rechthouckich op FD, men sal der drie linien welcker eerste FD, de tweede AC, de derde BI met KD, vinden de vierde euerednighe, welcke NO sy, deelende den balck HG in P, also dat den erm PG, sulcken reden hebbe tot den erm PH, ghelijck AL met EM, tot NO; Ick seg dat P het begheerde swaerheyts middelpunt is.

</s><s>Ende soo salmen voort mueghen varen met ander veelhouckeghe platten.

</s>

<s>

<s> <emph type="other"/>T'BEWYS<emph.end/>. </s><s>Ghelijck int eerste voorbeelt HI tot HL, alsoo den erm NE tot den erm NF, maer <arrow.to.target n="marg199"/> ghelijck HI tot HL, alsoo den vierhouck GHIK, tot den vierhouck GHLM, ghelijck dan GHIK tot GHLM, also NE tot NF, maer GHIK is euen an den driehouck ACD, ende GHLM anden driehouck ACB door t'werck, ghelijck dan den driehouck ACD tot ACB, alsoo den erm NE tot NF. </s><s> Het punt dan N is (door het voorstel des I boucx) des vierhoucx swaerheyts middelpunt. </s><s>Sghelijcx sal oock bewijs sijn des 2 ende 3 voorbeelts. </s><s> T'vierde voorbeelt is openbaer als wy bewesen hebben dat ghelijck DG, tot HB, alsoo den driehouck ACD, tot ACB in deser voughen: Nemende AC voor hoochde, ende DG ende HB voor gronden, soo heeft den rechthouck begrepen onder AC ende DG, sulcken reden tot den rechthouck onder AC ende HB, ghelijck DG tot HB <arrow.to.target n="marg200"/>; Maer ghelijck dien rechthouck tot desen, alsoo den driehouck ACD tot ACB, want elck driehouck is sijn rechthoucx helft <arrow.to.target n="marg201"/>, ghelijck dan DG tot HB, alsoo den driehouck ACD tot ACB. </s><s>Des 5 voorbeelts bewys sal oock claer sijn als wy bewesen hebben, dat ghelijck EK met IC tot LM, alsoo den vierhouck ACDE tot den driehouck ACB, aldus: Anghesien LM vierde euerednighe is der drie AD, AC, HB, de rechthouck begrepen onder AD ende LM, sal euen sijn <arrow.to.target n="marg202"/> an den rechthouck begrepen onder AC ende HB, Laet ons nu EK, IC, LM, ansien voor gronden, wiens ghemeene hoochde AD; </s>

<s>

<margin.target id="marg199"/>I. v. 6. B. E.

</s>

<s> T'vierde voorbeelt is openbaer als wy bewesen hebben dat ghelijck DG, tot HB, alsoo den driehouck ACD, tot ACB in deser voughen: Nemende AC voor hoochde, ende DG ende HB voor gronden, soo heeft den rechthouck begrepen onder AC ende DG, sulcken reden tot den rechthouck onder AC ende HB, ghelijck DG tot HB <arrow.to.target n="marg200"/>; Maer ghelijck dien rechthouck tot desen, alsoo den driehouck ACD tot ACB, want elck driehouck is sijn rechthoucx helft <arrow.to.target n="marg201"/>, ghelijck dan DG tot HB, alsoo den driehouck ACD tot ACB. </s>

<s>

<margin.target id="marg200"/>I. v. 6. B. E.

<margin.target id="marg201"/>4I. v. I. B. E.

<margin.target id="marg202"/>I6. v. 6. B. E.

</s>

<s>Des 5. voorbeelts bewys sal oock claer sijn als wy bewesen hebben, dat ghelijck EK met IC tot LM, alsoo den vierhouck ACDE tot den driehouck ACB, aldus: Anghesien LM vierde euerednighe is der drie AD, AC, HB, de rechthouck begrepen onder AD ende LM, sal euen sijn <arrow.to.target n="marg202"/> an den rechthouck begrepen onder AC ende HB, Laet ons nu EK, IC, LM, ansien voor gronden, wiens ghemeene hoochde AD; </s><s> Maer <arrow.to.target n="marg203"/> ghelijck die gronden <pb pagenum="74"/>tot malcanderen, alsoo de rechthoucken begrepen onder haer ende hare ghemeene hoochde, daerom oock ghelijck de twee gronden EK, IC, tot den grondt LM, alsoo dier gronden rechthoucken tot deses grondts rechthouck; maer die twee rechthoucken sijn elck het dobbel haers driehoucx; Ghelijck dan EK met IC tot LM, also het dobbel vanden vierhouck ACDE tot den rechthouck begrepen onder AD ende LM: Maer desen is euen an den rechthouck begrepen onder AC ende HB als vooren betoocht is, ende de selue rechthouck begrepen onder AC ende HB is het dobbel des driehoucx ACB, daerom ghelijck EK met IC tot LM, alsoo het dobbel des vierhoucx ACDE tot het dobbel des driehoucx ACB, ende veruolghens ghelijck EK met IC tot LM, alsoo den vierhouck ACDE tot den driehouck ACB, waer uyt de reste openbaer is. </s><s>T'bewys van het 6 voorbeelt is duer dit oock kennelick ghenouch. </s><s><emph type="other"/>T'BESLVYT<emph.end/>. </s><s>Wesende dan ghegheuen een rechthouckich plat: Wy hebben sijn swaerheydts middelpunt gheuonden naer den eysch.</s>

<s>V<emph type="other"/>IVOORBEELT<emph.end/>.</s>

<s> <emph type="other"/>T'GHEGHEVEN<emph.end/>. </s><s>Laet ABCDEF een ongheschickt seshouck sijn. </s><s><emph type="other"/>T'BEGHEERDE<emph.end/>. </s><s>Wy moeten sijn swaerheydts middelpunt vinden. </s><s><emph type="other"/>T'WERCK<emph.end/>. </s><s>Men sal den seshouck deelen in vier driehoucken, met eenighe linien als AC, AD, FD, vindende daer naer het swaerheyts middelpunt des vierhoucx ADCB door het 4 voorbeelt, t'welck G sy, ende des vierhoucx ADEF, t'welck H sy, ende de lini HG is balck. </s><s>Daernaer ghetrocken BI ende DK rechthouckich op AC, insghelijcx AL ende EM beyde rechthouckich op FD, men sal der drie linien welcker eerste FD, de tweede AC, de derde BI met KD, vinden de vierde euerednighe, welcke NO sy, deelende den balck HG in P, also dat den erm PG, sulcken reden hebbe tot den erm PH, ghelijck AL met EM, tot NO; Ick seg dat P het begheerde swaerheyts middelpunt is. </s><s> Ende soo salmen voort mueghen varen met ander veelhouckeghe platten. </s>

<s>[ Figuren ingevoegd: ]</s>

<s> Maer <arrow.to.target n="marg203"/> ghelijck die gronden <pb pagenum="74"/>tot malcanderen, alsoo de rechthoucken begrepen onder haer ende hare ghemeene hoochde, daerom oock ghelijck de twee gronden EK, IC, tot den grondt LM, alsoo dier gronden rechthoucken tot deses grondts rechthouck; maer die twee rechthoucken sijn elck het dobbel haers driehoucx; Ghelijck dan EK met IC tot LM, also het dobbel vanden vierhouck ACDE tot den rechthouck begrepen onder AD ende LM: Maer desen is euen an den rechthouck begrepen onder AC ende HB als vooren betoocht is, ende de selue rechthouck begrepen onder AC ende HB is het dobbel des driehoucx ACB, daerom ghelijck EK met IC tot LM, alsoo het dobbel des vierhoucx ACDE tot het dobbel des driehoucx ACB, ende veruolghens ghelijck EK met IC tot LM, alsoo den vierhouck ACDE tot den driehouck ACB, waer uyt de reste openbaer is. </s><s>T'bewys van het 6 voorbeelt is duer dit oock kennelick ghenouch. </s><s><emph type="other"/>T'BESLVYT<emph.end/>. </s><s>Wesende dan ghegheuen een rechthouckich plat: Wy hebben sijn swaerheydts middelpunt gheuonden naer den eysch.</s>

<s>

<margin.target id="marg202"/>I6. v. 6. B. E.

<margin.target id="marg203"/>I. v. 6. B. E.

</s>

<s><emph type="other"/>MERCKT<emph.end/>.</s>

<s> <emph type="other"/>MY<emph.end/> <arrow.to.target n="marg204"/>{Commentarius in quadraturam paraboles.} <arrow.to.target n="marg205"/></s>

<s> <emph type="other"/>MY<emph.end/> is onder het drucken ter handt ghecomen, Fredric Commandins <arrow.to.target n="marg205"/>verclaring ouer de viercanting der Brantsne van Archimedes, alwaer hy onder het 6 voorstel de manier beschrijft, om t'swaerheyts middelpunt te vinden van yder rechtlinich plat, ende dat op een ander wijse als de twee voorgaende. So ymant tottet ouersien der selue begheerich waer, salse daer vinden.

</s>

<s>

<margin.target id="marg204"/>is onder het drucken ter handt ghecomen, Fredric Commandins verclaring ouer de viercanting der Brantsne van Archimedes

<margin.target id="marg205"/>Commentarius in quadraturam paraboles.

<margin.target id="marg205"/>, alwaer hy onder het 6 voorstel de manier beschrijft, om t'swaerheyts middelpunt te vinden van yder rechtlinich plat, ende dat op een ander wijse als de twee voorgaende. So ymant tottet ouersien der selue begheerich waer, salse daer vinden.

</s>

<s><emph type="other"/>V. VERTOOCH<emph.end/>. <emph type="other"/>VII. VOORSTEL<emph.end/>.</s>

<s>V. <emph type="other"/>VERTOOCH. VII. VOORSTEL<emph.end/>.</s>

<s> <emph type="other"/>HET<emph.end/> swaerheyts middelpunt des vierhoucx met twee euewydighe <arrow.to.target n="marg206"/> sijden, is inde lini tusschen dier sijden middelpunten. </s>

<s>

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