. Electric railway journal . Coasting Recorder Mounted in Motormans Cab ing shoe for the customary wheel. This has a spe-cially-hardened steel contact piece set at the bot-tom of a grooved housing, which is mounted ontrunnions to permit the shoe always to rest flatagainst the trolley wire. The object in the use ofsteel for the contact piece is to reduce friction andwear on the copper contact wire, the length of bear-ing of about 6 in. permitting the low contact pres-sure of 18 lb. without causing arcs. Shoe mileagesof 10,000 are reported, and it is said that microme-ter measurements indicate t
. Electric railway journal . Coasting Recorder Mounted in Motormans Cab ing shoe for the customary wheel. This has a spe-cially-hardened steel contact piece set at the bot-tom of a grooved housing, which is mounted ontrunnions to permit the shoe always to rest flatagainst the trolley wire. The object in the use ofsteel for the contact piece is to reduce friction andwear on the copper contact wire, the length of bear-ing of about 6 in. permitting the low contact pres-sure of 18 lb. without causing arcs. Shoe mileagesof 10,000 are reported, and it is said that microme-ter measurements indicate the wear on the contactwire to be no greater than the standard wheel ontangents, and actually less on curves, possibly be-cause the shoe clings to the wire better. Trolley harps, in the general form, have becomequite thoroughly standardized, the important char- September 30, ; ELECTRIC RAILWAY JOURNAL 661. Air-Retrieving Trolley Base acteristics being ample lubrication for the pin onwhich the wheel rotates, and good sliding contactbetween the sides of the wheel hub and the flat-spring shunts that are attached to the sides of theharp. Ears for the harp appear in many instancesfor the purpose of preventing the wire from beingcaught anywhere but in the groove of the the trolley base, whose primary function is toprovide free motion for the trolley pole, as well asto support it, ball-bearing and roller-bearing designshave come into very general use. Recently an air-retrieving trolley base has beendeveloped to take the place of the various commonly-used trolley catchers and retrievers which aremounted on the rear dash, and which operate ingeneral by the action of centrifugal force on aseries of dogs and latches within a drum overwhich the trolley rope is wound. The air-retrievingbase, however, depends upon the action of mainreservoir pressure in a cylinder cast integral withthe revo
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