Signedon exterior label: THE / ESTERLINE-ANGUS / COMPANY, INC. / INDIANAPOLIC, IND. U.S.A.
Inscribedon lower interior label: "ZERO ADJUSTMENT", "ESTERLINE-ANGUS GRAPHIC AMMETER FOR USE ON D.C.", " THE ESTERLINE-ANGUS COMPANY, INC.", "INDIANAPOLIS, IND.", " U.S.A.", MAX. CURCUIT VOLTAGE, 750. FULL SCALE MILLI-VOLTS AT METER...AT LEADS...MODEL AW", " FULL SCALE MILLIAMPS 0-1.0, .5-0-.5", "AMPERES...SERIAL NO. 128958"
on upper interior label: SYNCHRONOUS CHART OPERATING INSTRUCTIONS
on upper interior label: diagram for plotter paper loading
scratched into exterior, upper panel: HSPH, 734-3300, x763
another label: Dept. of Industrial Hygiene / Harvard School of Public Health / Boston, Mass.
FunctionAn ammeter is used to measure the electric current in a circuit. In addition to this function, this instrument also records the electric current, and, indeed tracks changes in it over time.
Primary SourcesUsed to record data on rats in J. B. Little's physiology experiment at the Harvard School for Public Health.
The experiment is documented in “Bio-assay for antidiuretic activity in blood of undisturbed rats,” Journal of Applied Physiology 19 2 (March 1964).
ProvenanceJohn B. Little, Department of Cancer Cell Biology, Harvard School of Public Health; gift to CHSI, 2003.