Opuscula . 42 f 
Supponamus / 7- ^-s-, ut F fit po» 
m V Q -f- 2 S 
tentia in pun(fto proje(5lionis , quae fervat rationem reciprocam 
duplicatam diftantiarum , Prjeterea fupponamus , ab hac po- 
tentia F produci velocitatem projecflionis = V per fpatium 
= Z, ut fit =. 2FL i & sequatio novam formam induat 
F if dy , rsdy' 
— - — -\-zdy ' 
aj_ _ _2 
^ r 
Quandoquidem ^ efl aJgebraice integrabiiis, ftatim occur- 
rit methodus diftribuendi aequationem hoc pafto ^ r= 
rgdy- dy gy^ d<p ^ \ 
za y H ; o — 
. -f - H- _ , jjggc mtegre- 
3iQ* / , £y^d(p 
^ ^ 2FIQf-i-2S ^ 
tur , exhibet — M ■ == ' H 
- , Tffdy' y dy ^ g/d^ 
zdy -i — . ; — b ■ 
b _^ — „ . deteiminandam adQitam 
conftantem M, opus eft advertere iieri ^ := Q^, fi j = ^ ; unde 
erit Ai= ^^^. : verum ita oportet accipere fummatoriam ^ 
2 Z Q_ 
ut in puniflo projecflionis evanefcat . Hanc autem fummatoriam 
deinceps vocabimus — H. Itaque habemus ^-^^ -\ — — — 
LQ LQ_y g 
T,KP.IL Hhh tuto 
