. Artificial incubation and incubators ... LSTED S HOT-AIR INCUBATOR. structed with a different regulating apparatus. Fig. 60 gives arepresentation of it. As will be seen, it bears a resemblance to theone just described. The regulating apparatus consists of a hori-zontal long glass tube, ending in a bent, U shaped extremity, theend of which extends upwards above the horizontal part severalinches. The large tube is inside the egg drawer, and the bent ex-tremity outside, at one end of the machine. The horizontal por-tion is filled with alcohol; the U shaped part with mercury, onwhich floats a co
. Artificial incubation and incubators ... LSTED S HOT-AIR INCUBATOR. structed with a different regulating apparatus. Fig. 60 gives arepresentation of it. As will be seen, it bears a resemblance to theone just described. The regulating apparatus consists of a hori-zontal long glass tube, ending in a bent, U shaped extremity, theend of which extends upwards above the horizontal part severalinches. The large tube is inside the egg drawer, and the bent ex-tremity outside, at one end of the machine. The horizontal por-tion is filled with alcohol; the U shaped part with mercury, onwhich floats a cork connected oy a rod to the lever above, whichopens and closes the ventilators. The heat causes the alcohol toexpand, and that forces the mercury to rise, carrying the floatwith it. The hot water tank, cold water pan, etc., are identical with thatshown at Fig. 56. Later, the Graves machine was entirely changed, and the heating arrange-structed onthe Hoff-bator (seewith heatthe sameapparatused. Thisstructionvirtual fail-its manu-was stop-. Fig. hot-air incubator. ment con-the plan ofman Incu-Fig. 49),all around;regulatingwas retain-last con-proved au r e, andf a c t u reped. This machine was the result of an attempt to dispense with theliot water tank and boiler, and carry a current of heated airthrough the egg chamber from a heated surface of sheet iron orother metal. Fig. 61 gives an illustration of the outward appearance of themachine. The lamp O was placed directly under a horizontalsheet of iron, which was thinly 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
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectincubat, bookyear1883
