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ON A NEW DISPLACEMENT APPARATUS. 
ART. XXII.— OBSERVATIONS ON A NEW DISPLACEMENT AP- 
PARATUS, INVENTED AND PATENTED BY CHARLES 
AUGUSTUS SMITH, OF CINCINNATI. 
BY WILLIAM PROCTER, JR. 
D 
J. The displacement cylinder with a tin diaphragm at its base, 
B. The refrigerator surrounding the displacer, and which is kept 
supplied with cold water by means of the pipe and funnel G. 
C. Is the boiler or vessel containing the menstruum intended to act 
on the ingredients. 
D. Is a leaden tube connecting the boiler with the top of the dis- 
placer. 
E. Is the source of heat, which may be a large Argand burner, or it 
may with propriety be a small furnace, or the top of a stove. 
The instrument figured above has been invented by C. 
Augustus Smith of Cincinnati, with a view to the extraction 
of the soluble matter of drugs; and he has taken steps to 
procure a patent, securing him the pecuniary benefit of his 
