Voltmeter Small 310×320 Medium 620×640 Large 992×1024 Download Tiff Original 2326×2400 | (420.0 KB) Description Voltmeter test diagram for open-circuited field. Keywords Open-Circuit, voltmeter Galleries Motor Vehicle Mechanics Source: Automobile Engineering (Chicago, IL: American Technical Society, 1921) Courtesy the private collection of Roy Winkelman
