. Electric railway gazette . the numberof studs and area of contact of the heads are alsovaried so that the conducting capacity of theattached bonds shall be very great. For rails ofsmall cross section, say of 40 to .50 pounds peryard, the bond having two studs at each end andtwo large stranded cables in parallel will be madeof sufficient conductivity. For heavjrails from70 to 90 pounds per yard, bonds will be made withthree stranded cables in parallel. In the process of manufacture of these railbonds, the flexible conductors will be so manipu-lated, that when the head of the rail bond is cast
. Electric railway gazette . the numberof studs and area of contact of the heads are alsovaried so that the conducting capacity of theattached bonds shall be very great. For rails ofsmall cross section, say of 40 to .50 pounds peryard, the bond having two studs at each end andtwo large stranded cables in parallel will be madeof sufficient conductivity. For heavjrails from70 to 90 pounds per yard, bonds will be made withthree stranded cables in parallel. In the process of manufacture of these railbonds, the flexible conductors will be so manipu-lated, that when the head of the rail bond is cast,the metal will form Itself completely around thecable, thus assuring a perfect union of metalsand continuity of conductive capacity. Further,in order to avoid electrolytic action, we can com-pletely insulate the cables in any suitable manner,the insulation being preferably such as will with-stand the action of the moist soil throughouttheir exposed portions between the heads A. In addition to the bonding ot the rail CMP 9X B0h40 THfjEE. ^^| BOND . PIGS. 1 TO 5. VAILS METHOD OF RAIL BONDING. and the working of the motors at best efficiencyis impossible. These combined defects makeserious inroads in the coal pile, largely increas-ing the fuel requirements beyond what theywould be it normal conditions prevailed. The only perfect bond is one which will furnishat the joint a conductivity nearly equal to that ofthe first rail itself. The mechanical and elec-trical connection must be far superior to existingmethods. Careful calculations prove that therails themselves if properly bonded have largeconductivity when properly utilized. As an illus-tration, a single track of 56 pound rails, reducedto the basis of copper, is equivalent to a copper rodwhose diameter Is Inches. The same railshave a safe carrjing capacity of current equal to780 amperes. The rail joints are frequently bonded with galvanized iron wire, whose sreatest amperecapacity Is 07 amperes, or if N
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Keywords: ., bookcentury1800, bookdecade1890, bookidelectricrail, bookyear1895
