. Electric railway journal . Fig. 3—Boston & Northern Shops—Dipping Room forField Coils Works. The plant consists of a 250-gal. vacuum chamber anda melting tank of the same size, with piping, steam boiler,vacuum pump and a driving motor. In the process of impreg-nation the fields are first put into the vacuum chamber and May 14, 1910.] ELECTRIC RAILWAY JOURNAL. 859 heated for 16 hours; the compound is then liquefied in themelting tank, and a vacuum of 27 in. applied to draw it overinto the vacuum chamber. Air is then applied at a pressure of80 lb. per square inch for three hours, after which t
. Electric railway journal . Fig. 3—Boston & Northern Shops—Dipping Room forField Coils Works. The plant consists of a 250-gal. vacuum chamber anda melting tank of the same size, with piping, steam boiler,vacuum pump and a driving motor. In the process of impreg-nation the fields are first put into the vacuum chamber and May 14, 1910.] ELECTRIC RAILWAY JOURNAL. 859 heated for 16 hours; the compound is then liquefied in themelting tank, and a vacuum of 27 in. applied to draw it overinto the vacuum chamber. Air is then applied at a pressure of80 lb. per square inch for three hours, after which the com-pound is driven back into the melting tank. The coils areallowed to drip for three-quarters of an hour, and then areremoved from the chamber. The stripping tape is taken off the. Fig. 5—Boston & Northern Shops—Babbitting Devicefor Three Pairs of Sleeves coils, cleaning the coil surface, while one of two layers oftape are left on. The boiler supplying the steam pressurenecessary is connected with the vacuum chamber, in which arecoils for steam heating. The vacuum pump is operated by anelectric motor, together with a paddle in the melting the plant is in operation one man handles the boiler and
Size: 1611px × 1551px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
