ATIKA.'II -,. ii:. i.Ai: Al: . 





205. In the above investigation we have taken m to 

 16 maat of the attracted jmrti- thall 



te the maat of the attracted parti 



In order to form a prccUc idea : 



<se two Darticles ea 



nuuw equ :' maas t then /i will be the whole 



force which one of thc.sc> rxrrta on the other when the dis- 

 tance bctwctM: length. An. however, by 



mass we mn u=l,wo 



r it necessary to introduce /^. 



2p: W < 



cnlar arc on a 



attraction of 



tf\. ..',; . / tt,. ,/,,:,. 



Let -rl/? be any circular a 



draw a line bi> :ie angle 



JOft and take this line for the 



ax i> t POx - ^, QOP 0, 



//-2, O7?-r. The attrac- 



of the . /'O resolved 



resp , if p and < ! 



.same meaning M in Art. -Ji|, 



fore 



r . 



hese results with those in Art 804, it ap- 



pears tlia- in of a circular arc pu a particle at the 



the same in magnitude and direction as that of any 



straight 1 which toucAr* the arc AB and is terminated 



nes OA and OB produced, the arc and lino being 



*ed to have the same density, and the areas of their 



transverse 



