Electrical instruments and testing; how to use the voltmeter, ohmmeter, ammeter, potentiometer, galvanometer, the Wheatstone bridge, and standard portable testing sets
A 1907 practical handbook by Norman H. Schneider and Jesse Hargrave, published in New York by Spon & Chamberlain for electricians and students learning to use voltmeters, ohmmeters, galvanometers and Wheatstone bridges. The 103 line engravings are wiring diagrams and instrument sketches: letter-labelled terminals, zigzag resistance coils, battery symbols, dial scales marked in megohms, and dashed connection paths useful as technical-diagram vocabulary.
