Inside Out LibraryWiring diagrams of electrical apparatus and installations (1913)McGraw-Hill · New York, McGraw-Hill Book Company · leaf 198Fig. 301.—Two single-phase wattmeters connected for measuring two-phase power. MEASURING INSTRUMENTS 187Electric wiringInternet Archive · Public Domain Mark 1.0. Free to use for anything.More pictures from Wiring diagrams of electrical apparatus and installationsMore like this
