Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise on the care and management of steam engines, boilers and electric machinery (1922)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1260
for operating rheostat. 1 Eeceptacle for voltmeter plug 1 S. P.-S. T. field switch.* 1 S. P.-S. T. m^ain switch. 1 Eecording Watt-hour meter. A rear view of these panels is shown in Fig. 548. *S. T. means single throw. D. T. means double throw, i. e., the switch has two setsof clips and can be…
