-k If afc tin perfectly elastic tody fall from a nivm distance a upon an 

 Jrmnove,(b]< plane, the whole space described, from the beannninj,' to the 

 end of the motion, u> 



And the whole time of the body's motion is 



COMBINATIONS. See- Permutations. 

 COMPASS, points of. 



To reduce points of the c> .. r< r.v reckoned from the meridian , 



COMPASS, variation and dip of. Sec Variation. 

 CONCHOID ofNwmrtes, Equations to, %c. 



(a+g]*X(W-f~]= X *y*. 

 Or, referred to the centre of revolution of its generating Hue , the 



vipiution is ^ ~ -j- b. 



Area = 1 7> X (are of quadrant arc rad, ft <^ sin. ?/ -4- : - t ~ 



4. V it* ;. 



