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I have devised an incubator for bacteriologic work that keeps a very satisfactory uniform temperature and can be constructed easily by any one at small cost, as follows:
1. A galvanized iron box, 12 inches in all dimensions, is provided with a hinge or slide door on one side and openings for the adjustment of the heat-regulating apparatus.
2. The heat-regulating apparatus is expanding drum, A, suspended within the box and this on expansion and contraction under the influence of varying degrees of temperature operates a lever, B. This lever ends in a copper plate, C, which, when at rest on top of the box, is in contact with the two copper wires D and D′. The thermostat indicated in the diagram is such as is used on "Queen Chicken Incubators," except that the metal disk used in the incubator merely for controlling a current of air is replaced by
Emerson C. A CLINICAL INCUBATOR AT SMALL COST. JAMA. 1912;LIX(15):1375. doi:10.1001/jama.1912.04270100143013
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