Also that while in the case of thermo-electric
action the sustaining cause is molecular motion, supplied by an
external source of heat, in the case of chemico-electric action it is
the motion lost by the metal and liquid when chemically uniting
together. The direction of the current in thermo-electric cases
appears to depend upon which of the two substances composing a
junction increases in molecular activity the fastest by rise of
temperature, or decreases the most rapidly by cooling.
* * * * *
AIR REFRIGERATING MACHINE.
[Illustration: IMPROVED AIR REFRIGERATING MACHINE.]
Messrs. J. & E. Hall, Dartford, exhibit at the International Health
Exhibition, London, in connection with a cold storage room, two sizes
of Ellis' patent air refrigerator, the larger one capable of
delivering 5,000 cubic feet of cold air per hour, when running at a
speed of 150 revolutions per minute; and the smaller one 2,000 cubic
feet of cold air per hour, at 225 revolutions per minute. The special
features in these machines are the arrangement of parts, by which
great compactness is secured, and the adoption of flat slides for the
compressor, instead of the ordinary beat valves, which permits of a
high rate of revolution without the objectionable noise which is
caused by clacks beating on their seats.
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