Hydrostatic Blowpipe. 486 
will then be found ; and, by ced adjusting and: inspecting 
the vernier, the third figure will be ascertained. The liquids 
should be at the temperature of —_ 
If the liquid under examination, be lighter than water, as 
in the case of pure alcohol, it must be raised to the upper in- 
nt The column of water, measured by the scale of 1000, 
will then. be found at 800 nearly ; which shows that 1000 
parts of alcohol, are in weight, equivalent to 800 parts of wa- 
ter—or in other words, 800 is ascertained to be the specific 
gravity of the alcohol. 
The sliding rod and tube at R, between the cock and the 
glass tubes, facilitates the adjustment to _ index, of the col- 
umn of liquid in the right hand glass tube. When the rod is 
Se il aie it causes a small leak, by which 
the air and the columns of the liquids, ‘previously 
raised too ate ee the bag, may be allowed to fall, till the 
liquid which is to be assayed, is near the index. Then, by 
pushing the rod m, they may be gradually lowered, and ad- 
justed to the nee height with great accuracy. 
A rod of kind, graduated, mee answer the purpose 
of 3 vernier. 
vig of Conntchonr, may be advantageously furnished 
ae ; one opening from the tubes into the bag, 
the other: po the bag into the air. 
But upon the whole, I find a syringe preferable ; the ad- 
justing rod being included in the rod of the piston, which is 
orated for its reception, and furnished with a —— box, 
to render it air tight. 
The plummet P, and the screws at L, enable. the operator 
to detect, and rect tify any deviation, in the instrumen:, from 
perpendicularity. 
An account of the Hydrostatic Blowpipe, as now used in the 
Laboratory of the University of Pennsylvania. 
tre doliguine pansoge quoted from a memoir on the 
supply and application of the Blowpipe, which I haere 
2. -— 
The blowpipe is, on many pecans useful instrament 
to the artist and philosopher. By the former, it is used for 
the purpose Hi oo or solder small pieces of 
metal, and for the fabrication of glass instruments ; while the 
