128 On Specific Gravity. 
as far from the fulcrum as the other. 
A ohyonriaes is employed in this pieces, of which the fol- 
lowing figure will convey a correct idea. 
The rod of this instrument is not graduated, but is provi- 
ded with a band, (B) which can be sli ped alo along the rod, and 
to any part of it by means of a 
oe iden ter egietrs ie aes back, and ren- 
red equiponderant with the counter-weight, (W) by moving 
= from, or nearer to the fulcrum, so that The index 
point (I) may be exactly opposite the point of the beam. 
Place u mineral a vessel of water, and add as much 
of this fluid to the bucket, by means of the chyometer, as will 
cause the immersion of the mineral. The band (B) which is 
made to slip upon the rod, should be so fastened, by means of 
the screw, as to mark the distance Which the rod has entered, 
in expelling the water, requisite to sink ot mineral. Hav- 
ing removed the vessel of water, and the m ascertain 
how many times the same quantity of iter “which caused 
the immersion of the mineral, must t be employed to compen- 
sate its removal. 
_ Adding to the number thus found, one for the water, (pre 
introduced into the bucket, in order to cause the im- 
mersion of the mineral ,) we have its eptctie gravity ; so far as 
it may be expressed without fractions. When requisite, these 
