(’»3J ) 
Wonn-fpring E F prefling againfl: the Plug E to drive 
forwards the faid Wire h D, made to puih the faid 
Beam upwards with the Force of the Spring. TSS 
is a Stand, to which is fix’d the Pillar TC that 
fuftains the Balance ; and it has alfo a Slit SS to receive 
a Shank of the moveable Plate GG, to be fix’d in any 
Part of the Slit by a Screw underneath. 
Eperiment. 
Hang on B b, as in the Figure. Then let E F be fo 
applied to the Hole H, that its upper Wire hXik may 
go through a little Loop at D fo as not to thruft the 
Beam upwards, but be in the fame Pofition as if it did, 
that by hanging on the Weight W, the Brachium 
BC with BZ" and FE may be counterpois’d; and then 
the Aftion againft D and H may be eftimated without 
the Weight of the pulhing Pipe. 
Then drawing down the End of the Wire i, thruft 
it into the little Hole under D, and B will be fo pull’d 
downwards as to require the additional Weight of 
4 Ounces to be hung on at A to reftore the lEquili. 
brium, when B H is 4 Inches, B D 3 Inches, and the 
whole Force of the Spring equal to 10 Ounces. 
I need not here fay, that for explaining the fecond 
Cafe, B is to be fufpended at D, with the Plate 
GG fix’d to ftop it at the Place M to keep it from 
being pulh’d towards T, and that the upper End of 
G F E D ^ muft pulh into an Hole made under B, in 
which Cafe the Weight P muft be hang’d at B tore, 
ftore the .diquilibrium. 
p. <y. 
