. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . holes in the rails by means of a special press that forcesthem home until they not only fill the holes snug, but theirheads also flatten over on the opposite side of the rail,thereby giving greater area of contact between the bondand the rail. The fish-plate is then screwed back into bond belongs to what is known as the protectecl class,as the fish-plate not only protects it from mechanical injury §22 ELECTRIC RAILWAYS. :n and the action of the wcalluT, bnt also from the a
. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . holes in the rails by means of a special press that forcesthem home until they not only fill the holes snug, but theirheads also flatten over on the opposite side of the rail,thereby giving greater area of contact between the bondand the rail. The fish-plate is then screwed back into bond belongs to what is known as the protectecl class,as the fish-plate not only protects it from mechanical injury §22 ELECTRIC RAILWAYS. :n and the action of the wcalluT, bnt also from the attacks ofcopper tiiieves. Fig. 31 shows another type of protected bond, known asthe ball bond, because a small steel ball is used to expandthe contact between this bond terminal and the rail. As. Fig. 31. shown in the figure, the plug part of the terminal that goesinto the rail is hollow. To fix the bond to the rail, the plugis slipped into the hole and a small steel ball is then driven Si ® Q)
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectelectri, bookyear1901
