. The principles of bacteriology: a practical manual for students and physicians. of the pathogenicorganisms can be maintained. For this purpose a num-ber of different forms of apparatus have been are all based upon the same principles, however,and a general description of the essential points involvedin their construction will be all that is needed here. The apparatus known as thermostat, incubator, orbrooding-oven, is a copper chamber (Fig. 30) withdouble walls, the space between which is filled withwater. The incubating-chamber has a closely fittingdouble door, inside of which
. The principles of bacteriology: a practical manual for students and physicians. of the pathogenicorganisms can be maintained. For this purpose a num-ber of different forms of apparatus have been are all based upon the same principles, however,and a general description of the essential points involvedin their construction will be all that is needed here. The apparatus known as thermostat, incubator, orbrooding-oven, is a copper chamber (Fig. 30) withdouble walls, the space between which is filled withwater. The incubating-chamber has a closely fittingdouble door, inside of which is usually a door of glassthrough which the contents of the chamber may be in-spected without actually opening it. The whole appa-ratus is encased in either asbestos-boards or thick felt,148 THE INCUBATOB. 143 to prevent radiation of heat and consequent fluctuationsin temperature. In the top of the chamber is a smallopening through which a thermometer projects into itsUlterior. At either corner, leading into the space con-taining the water, are other openings for the reception. Incubator used in tacteriological wort. of another thermometer and a thermo-regulator, and forrefilling the apparatus as the water evaporates. On theside is a water-gauge for showing the level of the water 144 BACTERIOLOGY. between the walls. The object of the water-chamber,which is formed by the double-wall arrangement, is toinsure, by means of the warmed water, an equable tem-perature in all parts of the apparatus—at the top as wellas at the sides, back, and bottom ; the apparatus shouldbe kept filled with water, otherwise the purpose forwhich it is constructed will not be accomplished. Whenthe chamber between the walls is filled with water heatis supplied by a gas-flame placed beneath it. Fig. 31.
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