. The Street railway journal . 7l/2- 7/16 The usual tests were applied to a proportion of these polesat the works, and they gave most satisfactory results. Thethickness is good as regards uniformity. They are particularly The position of the trolley wire in relation to that of thetrack varies laterally. Where center poles are used each ofthe wires are 2 ft. 6 ins. inside of the middle line of each track. Where side bracket andspan poles carry the wiresthey vary from the middleof the track to a maximumof 6 ft. outside. The heightof the trolley wire fromthe rails is normally 21 ins. at the
. The Street railway journal . 7l/2- 7/16 The usual tests were applied to a proportion of these polesat the works, and they gave most satisfactory results. Thethickness is good as regards uniformity. They are particularly The position of the trolley wire in relation to that of thetrack varies laterally. Where center poles are used each ofthe wires are 2 ft. 6 ins. inside of the middle line of each track. Where side bracket andspan poles carry the wiresthey vary from the middleof the track to a maximumof 6 ft. outside. The heightof the trolley wire fromthe rails is normally 21 ins. at the ears. It variesfrom this, of course, at thebridges, etc. Flexible bow-string suspension is usedthroughout with a strand7/12 S. W. G. galvanizedsteel wire. The trolleywire is of the grooved sec-tion 0000 S. W. G. sec-tional area. It is to theusual specification as to tensile strength and conductivity,and was supplied by the British Insulated & Helsby CableCompany. The ears are of the mechanical type, with a main and clamp-. SECTION AT JOINT OF STAND-ARD GROOVED RAIL NOW USED IN LEITH
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
