Heating an instrument for treatment purposes by allowing hot water to flow through it requires the undivided attention of at least one attendant, and presents enough difficulties in exactly regulating and maintaining the required temperature to make this method fairly impracticable and to preclude its successful and general use. About a year ago I devised an automatic thermostat which is simple, practical, fairly inexpensive and obviates all the difficulties attending the regular use of "therapeutic heat" in office and institutional practice and has stood the test of eight months' daily use.
The illustration shows the following parts:
Two low voltage heat coils, one a "pilot" coil, A, mounted on a wall board, the other placed inside the distal end of the Artzberger psychrophore, P. These are of the same resistance, wound with 50 feet of No. 18 chrome resistance wire.
A rheostat for regulating voltage, L, wound with 150 feet
Cerf AE. A PRACTICAL AUTOMATIC THERMOSTAT FOR THE ARTZBERGER PSYCHROPHORE. JAMA. 1916;LXVII(24):1754–1755. doi:10.1001/jama.1916.25910240003014b
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