9952
X. TECHNOLOGY.--The Manufacture of Cocaine--The extraction
of cocaine with alkali and petroleum, with statement of
percentage yielded by various leaves. 9954
The Production of Oxygen by Brin's Process--The commercial
manufacture of oxygen by means of baryta--3 illustrations. 9950
#Transcriber's Note: Following entry not in original table of contents#
Deep Sea Dredgings: Examination Of Sea Bottoms. By THOMAS 9958
T.P. BRUCE WARREN.
* * * * *
BENIER'S HOT AIR ENGINE.
The hot air engine, although theoretically recognized for some time
past as the most economical means of converting heat into motive
power, has up to the present met with little success. This is due to
the fact that the arrangement of the motors of this class that have
hitherto been constructed has been such as to render them but slightly
practical. In the Benier hot air engine (illustrated herewith),
however, obstacles that were once considered insurmountable have been
overcome, and the motor presents many advantages over all the types
that have preceded it. Among such advantages we shall cite the
possibility of utilizing air at a high temperature (1,200 or 1,500
degrees), while the rubbing surfaces remain at a moderate temperature
(60 or 80 degrees).
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