Place of greatejl Attraction. 3 
1 . The great fuccefs of the experiment, lately made 
by the Royal Society, on the hill Schehallien, to deter- 
mine the univerfal attraction of matter, and the im- 
portant confequences that have refulted from it, may 
probably give occafion to other experiments of the fame 
kind to be made elfewhere : and as all poffible means 
of accuracy and facility are to be defired in fo delicate 
and laborious an undertaking ; it has occurred to me 
that it might not be unufeful to add, by way of fup- 
plement to my paper of calculations relative to the a- 
bove-mentioned experiment, an inveftigation of the 
height above the bottom of a hill, at which its horizon- 
tal attraction lhall be the greateft; fince that is the height 
at which commonly the obfervations ought to be made, 
and lince this belt point of obfervation has never been 
any where determined that I know of, but has been va- 
rioufly fpoken of or guelled at, it being fometimes ac- 
counted at {, and fometimes at \ of the height of the 
hill ; whereas from thefe inveftigations it is found to 
be generally at about only ~ of the altitude from the 
bottom. 
2. Let abceda be part of a cuneus of matter, its 
tides or faces being the two timilar right-angled trian- 
gles abc, ade meeting in the point a, and forming the 
indefinitely fmall angle bad. Then of any feCtion 
B 2 bced, 
