C<7 ] 
Calculation of this Maximum ftiews, that if the Prop 
isio Inches long, the Diftance meafufd upon the Balt, 
to which the upper End of the Prop muft be applied, 
will be io Inches the Bar itfel'f making then an 
Angle of about y2 Degrees 12 Minutes 5 and the hori- 
zontal Diftance between the Centre of Motion and 
the Foot of the Prop is then 1 1 Inches 
N. B. Three Things are to be remarked in this 
Cafe : 
Fir ft. That when the Angle made by the Prop and 
the horizontal Line, contain d between the Centre of 
Motion and the Foot of the Prop, is acute, as in the 
laft Experiment, there is always a Maximum : Whereas 
if the fame Angle was obtufe, there would be no poll- 
tive Maximum 5 for then the Prefiure would continu- 
ally increafe, the nearer the Prop is to the Centre of 
Motion. 
Secondly , That when the Angle of the Prop with 
the Horizon is acute, as in the laft Experiment, the 
Bar or long and heavy Body can be raifed by apply- 
ing the Power or Prop always with the fame Angle 
to the Horizon, quite up to a vertical Situation. 
Thirdly , That the firft Cafe, which is when the 
Prop is perpendicular to the Horizon, is only a parti- 
cular Cafe of this more general one. 
The Fourth Case, 
Is when the Angle made by the Prop with that 
part of the Beam contain d between the "Point to 
which it is applied , and the Centre of Motion, is 
given either acute or obtufe. 
As the Expreflion of the Power in this Cafe is fully 
as intricate as in the laft, I will only give one Example 
1 2 or 
