<subchap1 n="7" type="proposition"> <s id="s.000131">PROPOSITIO VII.</s> 

<subchap2 n="7" type="statement"> <s id="s.000132">Lineae descensus gravium super plano incli<lb/>
nato motorum, sunt in duplicata ratione <lb/>
diuturnitatum.<figure id="id.064.01.026.1.jpg" xlink:href="balia_demot_064_la_1646/064-01-figures/064.01.026.1.jpg"/></s> 

</subchap2> <subchap2 n="8" type="proof"> <s id="s.000133">Sint AB, CD plana pariter inclinata, super <lb/>
quibus moveantur gravia A, C, & sint EF <lb/>
ipsorum diuturnitates.</s> 

 <s id="s.000134">Dico AB, CD, esse in duplicata ratione ipsarum E, F.</s> 

 <s id="s.000135">Secetur AB bifariam in G, & erecta GH, per<lb/>
pendiculari longissima, fiant pendula HI, HK, <lb/>
quae sint inter se ut AB, CD, & eleventur in <lb/>
L, M, describentia arcus LI, KM, secantes <lb/>
GH in N, O, & ab N hinc inde secentur ar<lb/>
cus NP, NQ aequales quo ad sensum rectis <lb/>
GA, GB, & ductis PH, QH, secetur pariter <lb/>
arcus LI, in R, S, & intelligantur arcus PQ, <lb/>
RS, tam parvae curvitatis, ob maximam lon<lb/>
gitudinem pendulorum HI, HK, ut pro re<lb/>
ctis habeantur, puta portionis minimae, & pro<lb/>
inde aequales rectis AB, CD.<arrow.to.target n="marg21"/></s> 

 <s id="s.000136"><margin.target id="marg21"/>Per 3. pet.</s> 

 <s id="s.000137">Quoniam EF sunt diuturnitates AB, CD per