. Devices for use in fish hatcheries and aquaria. Fish culture; Aquariums. [from old catalog]. DEVICES FOR USE IN FISH HATCHERIES AND AQUARIA. 1033 and the siphon therefore is not feasible, the handle is removed from the cleaning apparatus and a pump attached. A small suction pump, such as used in gardens, is very suitable. If for any cause convenient, the apparatus may be left in the pond, for with the valve closed the suction can not act. OXYGENATION AND VACUUM-PRODUCING APPARATUS. This apparatus is in effect a section which may be introduced into a supply pipe, and consists of an exhaust ch
. Devices for use in fish hatcheries and aquaria. Fish culture; Aquariums. [from old catalog]. DEVICES FOR USE IN FISH HATCHERIES AND AQUARIA. 1033 and the siphon therefore is not feasible, the handle is removed from the cleaning apparatus and a pump attached. A small suction pump, such as used in gardens, is very suitable. If for any cause convenient, the apparatus may be left in the pond, for with the valve closed the suction can not act. OXYGENATION AND VACUUM-PRODUCING APPARATUS. This apparatus is in effect a section which may be introduced into a supply pipe, and consists of an exhaust chamber and an air-supply tube, with the essen- tial feature of a movable jet. The differences of water pressure and sizes of supply pipes render a stationary jet ineffective or even useless at times. The model here represented has a jet of 5 to 6 millimeters diameter, adjustable by means of a screw on the outside, and sends air into the water to a depth of about 4 meters, from an opening of 20 mil- limeters. It may be mounted with openings varying from 20 to 26 millimeters. The lower part of the apparatus is provided with a movable tube having a conical entrance, to divide the water better and make the vacuum stronger. The pressure of the water of the Vanne is dimin- ished in the sluices of the Trocadero Aquarium b}^ the many separate outflows, and to provide the de- sired currents, 13 of these oxygenators have been in- stalled. The fishes playing in the numerous silvery bubbles which rise from the bottom arouse much ad- miration from the public, and it will be readily be- lieved that the fish are clean and never sluggish. Small or large, they thrive with this kind of aera- tion, which brings them artificial currents of water which they did not find in these same ponds before. These currents, moreover, do not allow the food given to fall to the bottom when it is sprinkled in. The young fish, some 5 or 6 weeks old, may be seen to catch in passing the small particles of food which
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1910
