268 Prot. Hare on the Application 
To find the Specific Gravity of a Mineral, without Calculation, 
; and without Degrees. 
Fig. 2. 
WwW S 
J 
The preceding figure represents a balance employed in this 
process. It is in two respects more convenient than a com- 
mon balance. The moveable weight on one of the arms, ren- 
ders it easier to counterpoise bodies of various weights; and 
the adjustment of the index (I) by the screw (S) to the beam, 
saves the necessity of adjusting the beam to the index; the 
accurate accomplishment of which, by varying the weights, is 
usually a chief part of the trouble of weighing. 
One of the buckets, suspended from the beam, is five times 
as far from the fulcrum as the other. 
A chyometer is employed in this process, of which the fol- 
lowing figure will convey a correct idea. B 
The rod of this instrument is not graduated, but is provided 
with a band (B) which can be slipped along the rod, and fast- 
ened at any part of it by means of a screw. 
Let 
