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 1334
ed likely that the development of high-ten-sion transmission of power would have been very seriouslyhampered but for the invention of the oil switch. This use of oil has made it possible to rupture easily andsafely^ circuits carrying heavy currents at high voltage and^further, to open these… … Fig. 605type d westinghouse oil switch By means of these relays, used in connection with oil circuit-breakers, perfect protection can be secured for the apparatusto which they are applied. The term ^^switch^^ is given to those pieces of apparatusin which the contacts are similar to the ordinary…
