. Essentials of laboratory diagnosis; designed for students and practitioners. a glass front,which permits inspection of the interior of the incubator with-out actually opening the chamber, and so reducing the tem-perature. The whole apparatus is set upon an enclosed baseand is covered with asbestos board to prevent loss of heat fromradiation. In the top of the chamber is a small opening fittedwith a perforated cork through which a thermometer projectsinto the interior. Two other openings are provided, one for thethermometer which records the temperature of the circulatingwater, the other for
. Essentials of laboratory diagnosis; designed for students and practitioners. a glass front,which permits inspection of the interior of the incubator with-out actually opening the chamber, and so reducing the tem-perature. The whole apparatus is set upon an enclosed baseand is covered with asbestos board to prevent loss of heat fromradiation. In the top of the chamber is a small opening fittedwith a perforated cork through which a thermometer projectsinto the interior. Two other openings are provided, one for thethermometer which records the temperature of the circulatingwater, the other for the thermo-regulator. At one side of the 358 BACTERIOLOGIC METHODS. apparatus is a vertical water gauge provided with an upperopening for the introduction of water, and a stop-cock belowfor drawing off the water when occasion required. When in operation the apparatus should be kept full ofwater: otherwise, the object of the water jacket will be defeatedand the temperature of the interior of the chamber will not bemaintained. Heat is supplied to the incubator by a gas burner. ■•:.. —Thermostat or Ixccbator. (A. H. T. Co.) placed within the inclosed space below the chamber. The par-ticular form of burner usually employed is known as Kochssafety burner.* which is so constructed that should by accidentthe light be extinguished, the flow of gas would be almost im-mediately shut off. An ordinary Bunsen burner, well protectedfrom sudden gusts of air, will serve the purpose equally as Thermo-Regulator.—The efficiency of the thermostatdepends upon the proper and uniform temperature which ismaintained by the thermo-regulator. A satisfactory regulatorshould permit of a fluctuation of not more than ° C. in thetemperature within the chamber of the apparatus. COMMON DISEASE-PRODUCING ORGANISMS. 359 The commonest form of regulator is constructed upon theprinciple involving the expansion and contraction of fluids underthe influence of heat and cold. By means of such expans
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