Issue 23 and Volume 76.

AN INEXPENSIVE AUTOCLAVE FOR SMALL LABORATORIES Twenty-five Quart Pressure Cooker Utilized and Changed to Suit Purposes — Small Alterations Made in the Safety Valve THE following simple suggestion may prove of use to waterworks seeking an inexpensive form of autoclave and unable to afford a more elaborate installation : The board of public works of this city found it necessary to establish a temporary laboratory for the bacteriological examination of its water supply. An autoclave for the sterilization of culture was of course needed, but not wishing to purchase an expensive apparatus the outfit described below was utilized with success. A 25-quart “Denver” pressure cooker was obtained from a chemical supply house. This cooker is cast in heavy aluminum, is well constructed, of neat appearance, and is easily manipulated. Its cover is equipped with an 18/-inch air-cock, a 30-lb. pressure gauge and a safety valve designed to blow at 30…

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