184 On the Litrameter: 
into about 2200 parts, or degrees. 
On the left of the tube, there is another strip of brass, with 
another set of numbers, so situated as to comprise two de- 
rrees of the scale above-mentioned, in one. Agreeably to 
this enumeration, the height of the tubes is, by the aid ofa 
correspondent graduation on the vernier, divided into 1100 
parts or degrees. ~ | 
A small strip of sheet tin, (%) is let into a kerf in the wood, 
supporting the tubes, in order to indicate the commencement — 
of the scale, and the depth to which the orifices of the tubes 
must extend. ‘At distances from this, of 1000 parts and 2000 
parts, (commensurate with those of the scale) there are two 
other indices, (T, T,) to the right hand tube. Let a small 
vessel containing water, be made to receive the lower end of 
the tube, by the side of which the scale is situated ; and a 
similar vessel of any other fluid, whose gravity is Sought, be 
made to receive the lower end of the other tube ; so that the 
end of the one tube, may be covered by the liquid in question, 
and the end of the other tube, by the water. 
The bag being compressed, a great part of the contained 
air, is expelled through the tubes, and rises through the 
liquids in the tumblers. When the bag is allowed to resume 
its shape, the consequent rarefaction allows the liquids to rise 
into the tubes, in obedience to the greater pressure of the at- 
mosphere without. If the liquid to be assayed, be heavier 
than water, as for instance, let it be concentrated sulphuric 
acid, it should be raised a little above the first imdex, at the 
distance of 1000 de from the common level of the orifi- 
ces of the tubes. The vessels holding the liquids, being then 
removed, so that the result may be uninfluenced by any iné- 
quality in the height of the liquids, the column of acid — 
pf water, the two first numbers of specific gravity of the acid, 
