Marci of Kronland, Johannes Marcus, De proportione motus figurarum recti linearum et circuli quadratura ex motu, 1648

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1ratio EO maioris ad OD minorem, quàm FP minoris ad PD
maiorem. Et componendo ED ad OD, quàm FD ad PD. Eſt

autem ut ED ad OD, ita motus verticalis ad motum inclina
tum in plano CAK. Et ut FD ad PD, ita idem motus vertica­
lis ad motum inclinatum in plano CAI, per theorem 10. Cùm
itaque motus inclinatus in plano CAI ſit magis ſimilis verticali,
erit velocior motu inclinato in plano CAK.
15[Figure 15]
THEOREMA XII.
Grauitas movens inæqualium & ſimilium figurarum in eodem pla­
no inclinato, eſt inæqualis & æqualiter mouet.
Moueantur in plano AC duo triangula ABC maius, & A
DE minus: & ex angulis EC ducantur lineæ EP. CO paralle­
læ verticali AQ: lineæ verò FG. CF per illorum centra GF.
quæ per problema theorem: 1 erunt perpendiculares ad baſim
AB demum exijſdem centris FG cadant lineæ FM. GN. perpen­
diculares ad AQ. Quoniam itaque triangula CFH. EGI, & tri­
angula CFK. EGL ſunt ſimilia: erit CF ad EG, ut FH ad GI

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