. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . Q) Q) through the hole in the plug; this serves to expand the pluginto the sides of the iron hole and thus secures a goodcontact. If the first ball forced in goes through too ^1 (D freely, a little larger one is used. Fig. Wl shows anotherforiu of protected bond. This bond has a stranded con-ductor, but solid terminals, and the bond itself is ciuite 32 ELECTRIC RAILWAYS. §22 33. Fig. 33 shows a style of bond known as the plastic bond from the fact that the medium of contact i
. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . Q) Q) through the hole in the plug; this serves to expand the pluginto the sides of the iron hole and thus secures a goodcontact. If the first ball forced in goes through too ^1 (D freely, a little larger one is used. Fig. Wl shows anotherforiu of protected bond. This bond has a stranded con-ductor, but solid terminals, and the bond itself is ciuite 32 ELECTRIC RAILWAYS. §22 33. Fig. 33 shows a style of bond known as the plastic bond from the fact that the medium of contact is a paste oramalgam and is therefore plas-tic. This bond has the uniquefeature that the fish-plate it-self is used as the bond proper,the plastic part merely insur-ing that there shall be a goodcontact between the fish-plateand the rails. A piece of corkholds the plastic compound in position near the side of therails. The surface of the plate and rail is brightened beforethe plastic device is put in place, and as the contact surfacesare thereafter protected by the plastic compound, which re-mains soft, air and water are kept from the joints and rust-ing cannot take place. The idea involved in applying theplastic device can be more clearly seen in Fig. 34, whichshows the method of its application to the bonding of oldrails. In this case, a hole must be bored through the fish-plate and into the rail. The amalgam is shown at b. Theabove bonds have not been sele
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectelectri, bookyear1901
