. The principles and practice of roentgenological technique . \SL^ u. VOLTAGE SWITCH Pig, 37,_-Wiring and connections of rotating 4 arm type of commutation direct current interrupterlessmachine, rheostat and multiple inductance control. Snook. \\-IRING DIAGRAM A. C. MACHINE 39

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920