. Electric railway journal . standard tower is 44 ft. to the pointof support of the lowest insulator, and provision wasmade for extensions to be applied to the bases to raisesome towers from 10 ft. to 20 ft. higher. While theinsulators are placed in general one above the other,the middle one is offset. The vertical distance betweencables is 8 ft., and the middle one on each side projectsbeyond the uppermost and lowest a distance of 6 ft. The towers carry four cross-arms. The top one isfor the ground wires and below it are two short armsand one long one,all carrying stringso f insulators a tbot
. Electric railway journal . standard tower is 44 ft. to the pointof support of the lowest insulator, and provision wasmade for extensions to be applied to the bases to raisesome towers from 10 ft. to 20 ft. higher. While theinsulators are placed in general one above the other,the middle one is offset. The vertical distance betweencables is 8 ft., and the middle one on each side projectsbeyond the uppermost and lowest a distance of 6 ft. The towers carry four cross-arms. The top one isfor the ground wires and below it are two short armsand one long one,all carrying stringso f insulators a tboth ends. Aboutone-fourth of thetowers are straintowers, and thereare several specialtowers constructedto comply with theregulations of thesteam railroadswhich have to becrossed. The partsof the tower aregalvanized aftermanufacture, andall bolts, nuts,washers, clamps andother small partsare sherardized. All of the foot-ings for the stan-ard towers are of Salmon River Power Developmentstructural steel —Transmission Line Tower. 1382 ELECTRIC RAILWAY JOURNAL [Vol. XLIII, No. 25. shapes, galvanized and provided with holes for the at-tachment of timber or other structures for adaptationto special conditions. SPECIAL DESIGN AND OPERATING FEATURES OF THE PLANT From the above description it is evident that theplant of the Salmon River Power Company is unusualin a number of particulars. It is designed to operatein parallel with a plant six times as large as itself, situ-ated 200 miles away by transmission line. Its char-acteristics must be such that it will carry a proper pro-portion of the load. The smaller plant must be pro-tected from the effects of excessive loads on the lineand of short-circuits within itself: For this reason,as will have been noted, the design of the generators issuch that they will not be injured by any attempteddraft of excessive current, a large inductance being al-lowed for this purpose. From the operating standpoint the design of theplant involved studies of
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