On Specific Gravity. 131 
e on the rod of the chyometer be ascertain- 
ed; ch. when introduced five times successively, will ex. 
clude just water enough to overcome the resistance encoun- 
tered by a globe, in sinking im that fluid. Let the sector be 
opened, to the oo so designated ; let the globe be par- 
tially counterpoised, so as to float in any liquid heavier than 
, if the giobe be 
the value of the distance pease the rod has been intro- 
duced. Adding the numbers, =a found, to 800, the sum will 
be the specific gravity of the li 
For this process, the sector should be divided into 200 
parts, and, the proper opening being once oy ascertained, 
d be preserved, by means of an are, like d to 
common beam compasse 
Instead of a globe, a bydrometet, surmounted with a cup, 
may be employed, either with a graduated, or a sectoral, 
chyometer. 
In lieu of having points attached to the chyometer, as re- 
presented in the figure, it may be as convenient to have two 
small holes, for the insertion of the points of a pair of com- 
passes, either of the common kind, of the construction 
used by clock makers, or that which is known under the 
name of beam compasses. 
The compasses may be used to regulate the opening of the 
sector, or to ascertain, by the aid of that instrument, the com- 
parative value of the distances which the rod of the chyome- 
ter has to be introduced into its tube. 
toyed to convey an idea of the nature of the sector, to 
reader who may be unacquainted with it, I trust it will 
be sufficient to point out, that its construction is 
that of the foot-rule used by curpenterss We have only a 
pose such a rule, covered with brass, and each leg graduated 
into 200 equal parts, in order +o ell an adequate conception 
of the instrument employed by me. 
