. The Street railway journal . n sig-nal is displayed, and at an inclination of 60 degs. when safetyis displayed, this being provided in addition to the color indi-cations for use in case of failure of the lamps for the colorindications. The signal consists of two sections; the upper and rear por-tion contains (be lenses and position indicator for the homesignal, the colored glasses showing red for the danger or stop position, and green for the proceed or clear position. Thefront and lower portion of the case contains the distant signalmechanism, which is arranged to show yellow for the cautio
. The Street railway journal . n sig-nal is displayed, and at an inclination of 60 degs. when safetyis displayed, this being provided in addition to the color indi-cations for use in case of failure of the lamps for the colorindications. The signal consists of two sections; the upper and rear por-tion contains (be lenses and position indicator for the homesignal, the colored glasses showing red for the danger or stop position, and green for the proceed or clear position. Thefront and lower portion of the case contains the distant signalmechanism, which is arranged to show yellow for the cautionindication and green for the clear position. Thus it may beseen that color indications are depended upon, the position in-dication, which is provided by the small blade under each lense,being added merely as a tell-tale. Each lense is constantlylighted by two 4-cp incandescent lamps at the rear, the twolamps being connected in parallel for a safeguard in order thatone may be always lighted even if the other burns out; in this. VIEW OF THE INSTRUMENT CASE IN ADVANCE OF THE BLOCK SIGNAL, WITH DOORSOPEN TO SHOW ARRANGEMENT OF RESISTANCE GRIDS, ALTERNATING-CURRENT TRACK-CIRCUIT RELAY AND ASSOCIATED APPARATUS way the lighting is made as nearly absolutely reliable as pos-sible. These lamp circuits are, as above stated, operated fromthe local block transformers, the special double coils delivering50 volts, alternating current, for this purpose. The mechanism of the signal is clearly shown in the accom-panying drawing of the signal. The pneumatic cylinders,which operate the heavy vertical sliding frames carrying thecolor lenses for the signal indications, arc located in the baseportion of the case. As may be seen, the controlling magnetsfor the air valves of both the home and the distant signal cylin-der mechanism are located conveniently for access, as are alsothe various portions of the cylinders and slides. It should be 654 STREET RAILWAY JOURNAL. [Vol. XXIV. No. 15.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
