. Electric railway journal . V—(h = 4 + — + — 49 = It should be noted here that the items in the formulaby whose change the most rapid variation in the totalcan be brought about are C and I, these factors vary-ing as their squares. The distance the trolley wire should be inside the center of the track (r — \/R~ — K-\--~ \is 150-VC150)2- +^-^^- or + = ft. or 2 ft. 6 in. It should also be noted at this point how importantthe elevation is. In this case it was the basis for mov-ing the trolley wire three times as far in as would havebeen the case h
. Electric railway journal . V—(h = 4 + — + — 49 = It should be noted here that the items in the formulaby whose change the most rapid variation in the totalcan be brought about are C and I, these factors vary-ing as their squares. The distance the trolley wire should be inside the center of the track (r — \/R~ — K-\--~ \is 150-VC150)2- +^-^^- or + = ft. or 2 ft. 6 in. It should also be noted at this point how importantthe elevation is. In this case it was the basis for mov-ing the trolley wire three times as far in as would havebeen the case had there been no elevation of the outerrail. 106 ELECTRIC RAILWAY JOURNAL [Vol. XLV, No. 2 Sandbox Opened By Fender Trip BY A. R. JOHNSON, ASSISTANT TO SUPERINTENDENT OFEQUIPMENT, THIRD AVENUE RAILWAY, NEW YORK As a practical contribution to safe operation, theThird Avenue Railway, New York, has installed on itscars a simple mechanism which automatically opens thesandbox when the fender gate is tripped. This device. SKETCH SHOWING TRIPPING LEVERS FROM FENDER TOSANDBOX calls for a *4-in. x 1%-in. strap, clamped to the gatebar and hung close to the gate, as shown at 1 on theaccompanying sketch, and a second strap attached tothe sand plunger bar as shown at 2. When the fendergate is tripped strap 1 springs up, striking strap 2and thereby forces the sandbox rod forward to re-lease sand. The sand continues to flow until the fen-der is reset, which operation also closes the sandbox. Use of Metallic Salts for PyrometricPurposes A new method for measuring temperatures whereverheat is applied has just been developed by the CarlNehls Alloy Company, Detroit, Mich. This consists inthe use of different metallic salts which are made intomolecular mixtures that will melt down at different tem-peratures throughout the range between 200 deg. and1330 deg. Cent. They may be used in place of the morecostly pyrometers and also to check pyrometers. Thena cylinder is placed at the end of th
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