Title: Aquatic life
Identifier: aquaticlife51920baus (find matches)
Year: 1920 (1920s)
Authors: Bausman, Joseph E
Subjects: Aquariums; Fish culture
Publisher: Philadelphia : J. E. Bausman
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

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mqu&tU ILUt 83 dial) with another, half its diameter, mounted on the hour hand spindle. This idle gear should carry a disc one-half of which should be composed of brass, while the other should be of ebonite or other insulating substance, A brush bearing on the periphery of this disc connected to one side of the circuit and the other connected to the stationary con- "WIRIMQ DIAGRAM worth of this method was unfortunately not possible owing to unexpected neces- sity for dismantling the room used in the experiment. It was in progress on about I GO young Barbus conchonius and vitatus in a 4-foot tank. A control tank like the first in all respects and contain- ing similar fish, but feed by hand, failed to show the same growth although the
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tacts would cause every revolution of the liour hand (once in 12 hours), and con- sequently one-half a revolution of the disc to alternate twelve hours of closed circuit with twelve open, approximating the day light hours close enough for most purposes. In this manner if an eight day clock is used, the device need be tliought of but once a week. A complete and positive test of the priod in which the device was in use lasted little over a month. It was found that the amount consumed was consid- erably greater in the machine-fed tank, w^hich is the most significant fact to be noted. About four times as much was taken with by thus giving a little at a time all through the day, instead of a comparatively large quantity once a day. The writer believes tliat it would pay an

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