Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 113
ve). This is standardpractice on all instruments of this type. In this way the 96 ELECTRICAL MACHINERY instrument may be used to determine the polarity of a cir-cuit. The movable parts of such an instrument must hevery light to reduce the friction element to a minimum, soas not to interfere with… … Fia. 108 I^WWAAMM
Electric machinery
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
