. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 16 BULLETIN 951, U. S. DEPARTMEISTT OF AGEICULTUEE. COST OF OPERATION. The cost of electric energy for operating the heating equipment and the motor-driven circulation fan at 6 cents a kilowatt hour averages about 50 cents a day of 2i hours for each room. Prior to the installation of the present incubating rooms a large number of gas-heated incubators were used, the temperature being controlled by means of a bimetallic thermostat which regulated the. Fig. 13.—Chart of temperature '^ in incubating room, Biochem
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 16 BULLETIN 951, U. S. DEPARTMEISTT OF AGEICULTUEE. COST OF OPERATION. The cost of electric energy for operating the heating equipment and the motor-driven circulation fan at 6 cents a kilowatt hour averages about 50 cents a day of 2i hours for each room. Prior to the installation of the present incubating rooms a large number of gas-heated incubators were used, the temperature being controlled by means of a bimetallic thermostat which regulated the. Fig. 13.—Chart of temperature '^ in incubating room, Biochemic Division, April 7 to 14, 1919. The system of control used is not so sensitive as that used in the Pathological Division. flow of gas. These incubators occupied a large floor space, the con- trol of temperatures was poor, and the fire hazard was great. With the present installation of incubating rooms the capacity has been about doubled and the space occupied has been reduced about one- half. Furthermore, the cultures iiave grown better than ever before, a result mainly of the very uniform temperature which has been maintained in the incubating rooms. o. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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