. Artificial incubation and incubators ... nly covered with sand to equalize andretain the heat; above this was a false bottom extending fromeach end to within half an inch of the middle; on this bottom theegg drawers rested, leaving a space of three inches between them,through which the hot air passed upward. At each end of themachine was a ventilating flue, which extended the whole widthand opened into the nursery Gl, above which was the ventilatorV. Openings on the sides were provided to ensure a current offresh air passing into the heated chamber. 1IALSTED S HOT-AIR INCUBATOR. 77 The regul
. Artificial incubation and incubators ... nly covered with sand to equalize andretain the heat; above this was a false bottom extending fromeach end to within half an inch of the middle; on this bottom theegg drawers rested, leaving a space of three inches between them,through which the hot air passed upward. At each end of themachine was a ventilating flue, which extended the whole widthand opened into the nursery Gl, above which was the ventilatorV. Openings on the sides were provided to ensure a current offresh air passing into the heated chamber. 1IALSTED S HOT-AIR INCUBATOR. 77 The regulating apparatus was a long horizontal glass tube, whichwas filled with alcohol; this was suspended between the drawers,the back end terminating in a pin held by a bracket, and the frontin a small neck, which also ended in a pin, which latter was sock-eted into the bracket B; on one side of this neck was attached thebent glass tube AT, which was filled with mercury as shown byM; attached to this were levers F, F, one of which was connected. Fig. 64.—bakers incubator. by the wire IX to the lever of the ventilator IX, and the other bythe wire 2X to the lamp lever 2L. The heat in the egg chamber 6767 caused the alcohol to expand,and that forcing the mercury toward the extremity of the tube,the regulator being hung on pivots, the end T was carried downby the weight of the mercury, and the levers moving with it,opened the ventilators and turned down the lamp flame; as itcooled, the action was reversed. 78 DAY S AND BAKER S INCUBATORS. When first set up this regulating apparatus wprked to a charm,but its regularity was of short endurance. The evaporation ofthe alcohol and the oxidation of the mercury would put it out oforder in from five to seven days. The machine itself was notpractically worth a rush. It was impossible to keep an even heatin all parts of the drawers, and equally impossible to maintain aneven and proper moisture in the air without the closest hatch of f
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectincubat, bookyear1883
