File:Devices for use in fish hatcheries and aquaria (1910) (20865480346).jpg

Title: Devices for use in fish hatcheries and aquaria
Identifier: devicesforuseinf00vinc (find matches)
Year: 1910 (1910s)
Authors: (Vincent, Eugène) (from old catalog)
Subjects: Fish culture; Aquariums. (from old catalog)
Publisher: Washington, Govt. print, off.
Contributing Library: The Library of Congress
Digitizing Sponsor: Sloan Foundation

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DEVICES FOR USE IN FISH HATCHERIES AND AQUARIA. 103I consists of a long rubber tube attached, with metal handle and connections, to a blue-tipped pipette on one side and to a rubber bulb on the other. The bulb normally receives its air supply through a small rubber tube which is connected with a metal piston valve inserted in the large tube some 0.60 meter below the bulb. An auxiliary air valve in the handle is controlled by a little piston within reach of the index finger of the right hand. To use this apparatus have the lower end of the large tube and also the lower piston valve below the water level existing in the trough. Squeeze the bulb with the right hand, press the lower piston with the left, and then, putting the end of the glass tube in the water, release the bulb. Then release the piston and the siphon will have started. The glass tube may be directed at will. If the suction is too strong it may be regulated by the piston in the left hand. Should a good egg be picked up by mistake it may be readily replaced with- out waiting for it to discharge at the lower end of the rubber tube. Stop the flow of water by closing the lower piston with the left hand; then press the bulb to expel the air from the small tube upward into the larger, the mouth of the glass tube being meanwhile under water. If this does not force the egg out of the glass tube continue to hold the piston closed, squeeze the bulb with the right hand, and then with the in- dex finger press the little auxiliary piston at the end of the handle. If now the bulb is released it will fill. Removing then the pressure from the little piston on the han- dle there can be no escape of air at this point when the bulb is compressed, but only backward in the main tube, for the discharge outward is cut off by the closed lower piston valve. The egg will thus be forced out of the glass tube. Care should be taken to avoid drawing water into the bulb, but in such event a discharge may be effected by proceeding as just described except that the lower piston valve is in this case left open.
Text Appearing After Image:
-.Apparatus for cleaning hatching i troughs.

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