Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1328
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-cbreakers, perfect protection can be secured for the apparatuscto which they are applied. The term switch^^ is given to those pieces of apparatus.in which the contacts are similar to the ordinary…
