Classic Analog Voltmeter and Ammeter - Historical Electrical Measurement Instrument #183235 (License: Personal Use)

This black-and-white technical illustration depicts a classic analog electrical measuring instrument from the early 1900s, combining a voltmeter (top scale) and ammeter (lower scale) in one circular dial, marked “VOLTS” and “AMP” respectively. The device rests on a wooden base with a prominent zigzag coil resistor and adjustable mounting screws, suggesting use in laboratory or field testing. The internal mechanism includes a visible moving-coil galvanometer labeled “O.R.G.M.” and calibration markings such as “500” and “10”.

Commonly used in historical science education, museum exhibits, or articles about the evolution of electrical instrumentation; ideal for users researching vintage electronics, engineering history, or seeking authentic illustrations for STEM content.