r«j ' ) 
rate, unlefs an additional Weight of 4 Stone be hang. 
^ &c. pulhing upwards 
the Beam between B and D becomes Kghter 
Which was alfo to be demonftrated. ^ 
Scholium I. 
Hence knowing the abfolute Force of the Man that 
pulhes upwards, (that is, the whole oblique S 
the Place of the Point of Trufion D inrTfL^ a V 
made by the Diredion of the Force with a PerS " 
cular to the Beam at the fame Point, we may Xve a 
ih. R added mhe 
Beam B in any Inclination of the Diredion 
of the Force or Place of the Point D. 
Rule for the firj Cafe. 
Firft find the perpendicular Force by the folio winir 
Heraonftration is known to all tLf 
underftand the Application of oblique Forcel 
As the Radius : 
To the perpendicular Force. 
I enfftlTo^tirR multiplied into the 
Length of the Brachium B C, minus the faid Force 
multiplied into the Diftance D C, will give the Value 
of the additional Force atB, or of the Weight requM 
to reftore the jEquilbirium at A. ^ ^ ^ 
Algebraical Way Let 0 f ' 
exprefs the oblique Force, //the Perpendicular Forced 
^ and 
