ON A NEW DISPLACEMENT APPARATUS. 
99 
invention. The propriety of this course of the inventor, in 
thus withholding the free use of his invention from the 
Pharmaceutical public, it is not for us to discuss ; nor are 
we altogether confident that his claims to originality in the 
principles of his machine can be satisfactorily maintained — 
but so far as it is designed to improve the Pharmacy of our 
country, we wish its inventor success. 
At the request of Charles R. Smith who brought the ap- 
paratus to this city, and who is one of the proprietors of the 
patent, several experimental trials have been made with it, 
with the design of testing its powers; and the object of this 
paper is to exhibit the results of these trials in a fair, un- 
biassed statement. 
As exhibited above, the machine consists essentially of a 
refrigerated displacer, a boiler, and a tube connecting these, 
through which the vapour passes from the latter to the for- 
mer. In operating with this instrument, the substance to 
be treated, in the state of coarse powder, is placed on the 
diaphragm in the displacer, and should be sufficient in 
quantity to fill it within a short distance of the top, or as a 
general rule as high as the surface of the water in the re- 
frigerator. The boiler should contain the menstruum des- 
tined to act on the ingredients in the displacer, and should 
be greater in quantity than the amount of product sought 
after, by at least fifty per cent. The boiler and displace- 
ment cylinder are then connected by the leaden tube to 
which is attached the lids, and the joints secured by luting. 
A current of cool water is conducted to the bottom of the 
refrigerator, whilst the warm fluid is carried off by the pipe 
at the top. Heat is then applied to the boiler and as the 
only outlet for the vapour is through the substance in the 
displacer, it becomes condensed in its passage amongst the 
particles and gradually saturates the whole mass. As soon 
as this is effected the saturated fluid commences to pass into 
the vessel below. 
