. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE m BULLETIN No. 951 ^Ml^^jif^? Contribution from the Bureau of Animal Industry "^ Contribution from the Bureau of Animal Industry JOHN R. MOHLER, Chief. Washington, D. C. PROFESSIONAL PAPER June 4, 1921 METHODS FOR CLOSE AUTOMATIC CONTROL OF INCUBATING TEMPERATURES IN LABORATORIES. By John T. Boavex, Technologist, Dairy Division. CONTENTS. Page. Constimction of temperature-control compartment Construction of room Heating equipment Page. Description of temperature-control syst
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE m BULLETIN No. 951 ^Ml^^jif^? Contribution from the Bureau of Animal Industry "^ Contribution from the Bureau of Animal Industry JOHN R. MOHLER, Chief. Washington, D. C. PROFESSIONAL PAPER June 4, 1921 METHODS FOR CLOSE AUTOMATIC CONTROL OF INCUBATING TEMPERATURES IN LABORATORIES. By John T. Boavex, Technologist, Dairy Division. CONTENTS. Page. Constimction of temperature-control compartment Construction of room Heating equipment Page. Description of temperature-control systems 7 Temperature recorders 11 Cost of operation iG The automatic control of temperature within close limits is A'ery important in many lines of commercial work. It is of special im- portance, in fact, is a necessity, in laboratories where chemical, bac- teriological, and physiological investigations are conducted. In manj^ instances success in the maintenance of cultures depends upon tha ability continuously to maintain practically constant temperature. Pathogenic microorgani'-ms, as a rule, do not grow except within very narrow temperature limits, the optimum temperature being about ° C. (° F.). The Bureau of Animal Industry, United States Department of Agriculture. i)r()duces tuberculin on a large scale; about ICOOO culture flasks of 300 c. c. capacity are maintained to produce the required (juantity. The tubercle bacillus is very sensitive to temperature changes. In order to obtain the best groAvths, therefore, the tempera- ture during the peiiod of incubation should be maintained practically constant at the optiminn of about ° C. To hold the temperature in all jiarts of the chamber approximately constant re(|uii-es con- siderable care, especially if the chamber is lai'ge. Other work cai'ried on l)y the bureau includes the study, by bacteriological means, of other diseases of domestic animals. The 3015-1°—21. Please note that these images are extracted fro
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