. Artificial incubation and incubators ... connected with a galvanized iron boiler, heatedby a lamp. By a proper connection, the water is constantly in cir-culation between the boiler and tanks. There is no regulating at-tachment. tathams incubator is another Pennsylvania invention, its principal features being thedivision of the water tank by a horizontal partition of metal, per-forated at each end, through which the water has to pass to reach 104 TATHAM*S INCUBATOR. the return flue; this flue passes down and under the egg drawer,into a moisture pan, which it traverses to and fro a number oft
. Artificial incubation and incubators ... connected with a galvanized iron boiler, heatedby a lamp. By a proper connection, the water is constantly in cir-culation between the boiler and tanks. There is no regulating at-tachment. tathams incubator is another Pennsylvania invention, its principal features being thedivision of the water tank by a horizontal partition of metal, per-forated at each end, through which the water has to pass to reach 104 TATHAM*S INCUBATOR. the return flue; this flue passes down and under the egg drawer,into a moisture pan, which it traverses to and fro a number oftimes before passing out to be re-heated. The heating apparatusis the continuation of this same flue or tube, arranged in a spiralcoil, and placed over a peculiarly formed gas burner. This burner is fed through a double supply tube, in one arm ofwhich is an elbow-like depression, opening at the bottom into oneend of a U shaped glass tube (this tube is almost identical with tha*described in the Graves machine). The long part of this tube is. Fig. 81.—renwicks with alcohol and inserted into the egg chamber; the U shapedend is outside, and filled with mercury. As the heat in the ma-chine increases, the alcohol expands, and forces the mercury upso that it rises above the elbow in the main gas tube, thus cuttingoff the flow through that, and forcing it to pass through the otherand smaller tube, in which is a stop cock, thus reducing the flameto as small a jet as is wished. Another noticeable point is the ventilation. The heat radiatedfrom a metal tank over the eggs passes over each end of thedrawers downward through a flue, and then turning upwards, is RENWICK*S THERMOSTATIC INCUBATOR. 105 carried out through a ventilator at the top. The supply of freshair is received from a valve in the bottom, from whence it passesover the water pan and upwards between the drawers, and thenceoff through the flue above mentioned. The machine has some very good points about it, but
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectincubat, bookyear1883
