C 1 
the Prop is taken away, the Force drawing in the Di- 
rection of the Prop will keep the Beam in /Equili- 
bria 5 and a Force ever fo little fuperior to the Friction 
added to the Power, will make it overpoife the Beam 
and raife it higher $ but overcome the Power and 
bring down the Beam, if it be added or applied to the 
Beam. 
Tho' in every Cafe and Experiment we have this 
Analogy taken from mechanical Principles, viz. that 
The Intenfity of the Power : 
Is to that of the W eight : 
As the Diftance of the Line of Direction of 
the Weight : 
Is to the Diftance of the Line of Direction of 
the Power, 
Yet to find thofe Diftances nicely in the feveral Ap- 
plications of the Prop, we muft have Recourfe to geo- 
metrical ConftruCtions and Reafonings. With theft 
and the algebraical Expreflions of the fame, the Ex- 
periments exactly agree. 
I defign to give to the Society a Paper upon this. 
SubjeCt, wherein will be explain'd not only the In- 
veftigation of the Proportion between the Power or 
Preffure fuftain'd by the Prop and the Weight of the 
Body fupported, but alfo the Determination of the 
Maximums of Preffure, where there are any, and the 
Nature and organical Defcriptions of fome particular 
Kinds of Curves of the third Order, deferibed by 
one End of the Prop in its fucceffive different Situ- 
ations. 
The Numbers made ufe of in theft Experiments 
.are the refult of the Calculations,* and all I propofe 
now is to ftiew the Experiments by Means ef a Ma- 
.ehine 
