[ <58 1 
<©t Experiment 5 and, for the greater Satisfaction of 
thofe that fee it, I chofe that, wherein the Prefiure is 
in its Maximum . I fuppofe, as before, the Angle 
made by the Prop, ((till 10 Inches long) with that Part 
of the Beam contain'd between the Point to which it 
is apply'd, and the Centre of Motion, to be acute and 
of 60 Degrees 5 then the Maximum of Prcfliire will, 
be, when the part of the Beam intercepted between 
the Centre of Motion and the upper End of the Prop 
is 12 Inches the Bar is then elevated about yo 
Degrees 1 3 Minutes, and the horizontal Diftance be- 
tween the Centre of Motion and the Eoot of the Prop 
is then 1 1 Inches ~ Q 7 6 - 
N. B . Obferve alfo in this Cafe as in the laft. 
Firft y If the Angle made by the Prop, and the part 
of the Beam intercepted between the Point of Appli- 
cation and the Centre of Motion, is acute, there will 
always be 1 Maximum. The contrary will happen, 
if that Angle is obtufe.. 
Secondly , If the Angle is acute, the Bar cannot be 
raifed up to a vertical Situation by applying the Power 
or Prop conftantly with the fame acute Angle ; but' it 
may be raifed quite up, if the Angle of the Prop with 
the Beam is ohtufe. 
Thirdly , The fecond Cafe is but a particular Cafe 
of this general one. For the Reafons of all thofe 
Things, the Corrections needfary to be made on ac- 
count of the Thicknefs of the Bar, the Nature and or- 
ganical Dcfcription of fome Curves, and feveral other 
remarkable Confiderations on this Subjed, I muft refer 
4:0 the Paper I (hall give in to the Society. 
XIV. Tht 
