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 1274
rs. 1 T. P. S. T. oil switch, with overload release. 3 Current transformers. Three ammeters—one for each phase—are furnished foreach line, to facilitate the detection of unbalancing due toopen circuits or leakage. With balanced loads, the amme-ter pointers should show equal deflections under…
