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March 6, 1915


Author Affiliations

Berkeley, Cal. Chemist and Bacteriologist, Health Department Laboratory

JAMA. 1915;LXIV(10):823-824. doi:10.1001/jama.1915.25710360003018c

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The method of staining the tubercle bacillus by holding the slide over a small flame to steam is both slow and tedious, especially when a number of slides are to be stained. To overcome this, I have devised a simple electric heater which can be made in any laboratory, and whereby a number of slides can be stained at the same time.

The heater consists essentially of a heating unit mounted on a galvanized iron test-tube support (E. & A. No. 6694). To the under part of the wire frame is fastened a thin piece of sheet iron to secure even distribution of heat and to prevent liquids being spilled on the heating element. About a quarter inch below this is the heating unit. This was made by wrapping about 30 feet of Nichrome ribbon wire 1/32 inch wide around a rectangular sheet of mica of nearly the same dimensions

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