- = x' (sin\|/ coscj) cosfl co 

 jp' ( cosfl cos^/ coscp -f si 

 -}- -s' sin 9 cos^/ 



sin0) 



=. x 



unde deducuntur 



ar' = JF (cosQ sin;|/ sinip -f" cosvp cos(|) ) 

 4- y ( sin if/ coscp cosfl cosv|/ sin<J) ) 

 + z sinfl sincj) 



y' x (cosfl sinxp sin(|5 cosvf/ sinc^)) 

 y ( cosfl cosc|) cos\f/ + sinif/ sincp) 



z' = a? sinfl sinvf/ -\-y sin0 costf/ -{- z cosfi 

 Ut formulae (24) accomodentur curvae intersectionis solidi per planum 

 cujus positio determinatur ope anguli ejus intersectionis in piano 

 (x, y} cum axe x et inclinationis ejusdem plani ad planum xy, in his 

 poni debet z' = o, unde 



x = 07' cosvj/ -j- y' cosfl sin\|/ 

 ^ = 07' sin\{/ + JK' cos$ cos4/ 

 z = % y' sinfl 

 in quibus 6 est angulus inter plana x'y' et , 



l \t*.^ .1 (I .\ . 



(*5) 



et ^ angulus inter 



