( 751 ) 
" = cotiftanti ) fit jam Abfciffa AL=x l ordinate 
LG:2=y r adeoque BG=dx, GG=:dy, BG^v'dx^ j fitque a 
dx I 
iihea quaclibet conftans Erit -7=—== =~ , unde dxVa 
=:v'yxv'dx^+^y''* ^"^^^ Curva dx eft^ad '✓ix^-f-^y^ 
Subftangens ad Tangentem ; Ergo talis eft mtura Oxvvx 
qxxxd'ix ut ejus fuhtangens fit ad Tangentem ut i/a ad v^y. 
Qaam utique Gycloidis proprietatetn effe fciunt omnes, quibus 
nocum eft Tangentem Gycloidis effe parallelam Chordx arcus 
contermini inCirculo genitore, cujus Diameter eft a, & cujus 
vertex deorfum fpedat, 
Et pari facilitate Curiam invenire poffum Gelerrimi Defcenfua 
proqualifaet alia g^avitatis Hypoth$li» 
m 2 
