Voltmeter and ammeter indicating the direct pull of a solenoid and tubular core Voltmeter and ammeter
Galvanometer, magnetic needle type, wooden base, metal fittings in glass cover, by William Hart of Edinburgh, 1900-1920 Galvanometer, magnetic needle type 1900-1920
Four ammeters in white plastic and perspex. 'Made in USSR Educational' on front Four ammeters in white plastic and perspex 1970-1985
Set of 8 ammeters by Philip Harris Ltd. Six circular 0-3 amps, two quadrant 0-15 amps Set of 8 ammeters by Philip Harris Ltd. Six circular 0-3 amps 1950-1970