Portable Power Factor Meter, England. A precision electrical measuring instrument designed for determining the power factor of alternating current systems, indicating the phase relationship between voltage and current in electrical circuits. The large circular direct-reading dial is calibrated to show both lagging and leading power factors, allowing engineers to assess the efficiency and reactive characteristics of electrical loads. Used in electrical power engineering, laboratory testing, and industrial maintenance to evaluate motor loads, transformers, and distribution systems. c.1920s–1940s.
W32 x D27 x H26 cm.
Untested.
