L ( 'i? ) 
be oyer-poifed by the Weight W, which did before onlv. 
, counterpoife the Weight of his Body and the Scale ^ 
If the common Center of Gravity of the Scale P 
^d the Man fuppofed to ftand in ilhe at / and t£ 
Man by thruftmg againft any Part of the Beam caufe 
the Scale to move outwards fo as to carry the fat’d com 
ETwin 'k ^ inftead of B E 
^ w Direaion of the co,^ 
Ratio of^'^lm B c'"' T?° • '"'i‘ 
by feveral Writers of Medlnkksf bu^nTone^'t^^ 
I know of has confider’d the Cafe when the Scab is 
kept from flymg out, as here by the Port GG which 
keeps It in its Place, as if the Strin?s of rL q" i 
were become inflexible. Now to explain this Cafe^ 
let us fuppofe the Length B D of half of the Br«:hi 
um B C to be equal to 3 Feet, the Line B Eto 4 St' 
the Line ED of c Feet to hf» 
the Man pulhes, DF and F E to be^efpSvdvTS 
and parallel to B E andBD, and the wholes aL'^ 
Jute Force with which the Man pulhes equal to for 
aWe to raife) 10 Stone. Let the obljue Se R^D 
(—10 Stone) be refolv’d into the two^FandEB 
(or Its Equal F D) whofe Diredions are at right AnaS 
to each other, and whofe refpedive anantitks feTn! 
rhaf ^ U E F and B E are in 
E F SarS to B ^ ^ow fin e 
J. E to B DC A, the Beam, it does no wav 
a ed the Beam to move it upwards ; and therefore 
there IS only the Force reprefented by F D, or 8 Stone 
to pulh the Beam upwards at D. For the fiiue R»,r 
and becaufe Adion and Readion are equal, the Scale 
will be pulh d down at E with the Force of 8 Stone 
"T alfo. 
