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After having studied the question systematically, Beasley, in a recent article,1 suggests, as the most practical disinfectant for thermometers, the Pharmacopeial formaldehyd solution (liquor formaldebydi), which, as is well known, is a 40 per cent. solution of formaldehyd in alcohol.
For many years I have been accustomed to place a small cotton plug in the cap of my thermometer ease, into which I poured, every week or two, a sufficient quantity of formaldehyd solution to saturate the cotton. Even after the lapse of two weeks the odor of formaldehyd is strong. Any ordinary thermometer case may be used for this purpose if the cap fits securely. All that is necessary is to wash the thermometer after use in running water and soap and to insert it in its case with the stem in contact with the cotton. My case is of metal (see illustration) with a screw-top A and
Gros EL. AN ANTISEPTIC THERMOMETER CASE. JAMA. 1912;LVIII(23):1756. doi:10.1001/jama.1912.04260060105010