. Electric railway review . ars becoming stalled from loss of poweron railroad crossings has therefore been introduced by The NationalRailroad Trolley Guard Company, 11 Pine street, New York. One of the guards manufactured by this company is presentedin the accompanying illustration, which shows it to consist of awire mesh shaped in the form of an inverted V, extending overand along the trolley wire. An advantageous feature of this guardis is extreme lightness, those of aluminum weighing 13 ounces andthose of copper and galvanized iron weighing but 18 ounces perrunning foot. On account of this
. Electric railway review . ars becoming stalled from loss of poweron railroad crossings has therefore been introduced by The NationalRailroad Trolley Guard Company, 11 Pine street, New York. One of the guards manufactured by this company is presentedin the accompanying illustration, which shows it to consist of awire mesh shaped in the form of an inverted V, extending overand along the trolley wire. An advantageous feature of this guardis is extreme lightness, those of aluminum weighing 13 ounces andthose of copper and galvanized iron weighing but 18 ounces perrunning foot. On account of this low weight it is unnecessary toprovide extra heavy poles and guys to support the guards. Toinsure perfect contact and durability the meshes are made of No. 10galvanized and copper wire and No. 9 aluminum wire. They arefitted with substantial hangers spaced five feet apart. This protec-tion can easily be installed without changes to the present overheadequipment. The construction of the National guard affords ample strength. The National Trolley Guard. and high electrical conductivity. The use of the wire net reducesthe wind resistance to a minimum and effectually prevents theaccumulation of ice, which otherwise might weigh down thewire and cause the poles or- guys to fail. The width of the singlei for one wire is 10 inches and the depth of the troughlies. Provision has been made In the design to accommodatetwo trolley wires. Such guards are made 15 Inches wide, and spacethe trolley wires G inches between centers, the depth of the guardbeing 5 inches. The hangers provided with this guard are drilledand tapped to take any standard ear. thus maintaining standard-ization of the overhead work. The National trolley guard, consisting simply of wire not withsuitable hangers. Is easily Installed and shipped, a guard consistingsimply at a roll 01 patent wire netting cut to the proper lengthand a set of bangers for each five feet of length. Therefore thisguard can easily be Installed by
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
