. Railroad structures and estimates . eteand the pa\ing blocks are laid on a 1-in. sand cushion. Highway Crossing Alarm Bell. (Fig. 107.) — At highwaycrossings where traffic does not warrant a watchman or safetygat€S, an electric alarm bell attached to the road-crossing sign,or erected on a special iron or wood pole, is often used, arrangedso as to ring ahead of an approaching train; a light also is some-times pro^ided above the bell. The track rail joints are bondedfor a distance of 1000 to 3000 ft. on either side the crossing andinsulated for battery- and bell circuit, a battery being necess
. Railroad structures and estimates . eteand the pa\ing blocks are laid on a 1-in. sand cushion. Highway Crossing Alarm Bell. (Fig. 107.) — At highwaycrossings where traffic does not warrant a watchman or safetygat€S, an electric alarm bell attached to the road-crossing sign,or erected on a special iron or wood pole, is often used, arrangedso as to ring ahead of an approaching train; a light also is some-times pro^ided above the bell. The track rail joints are bondedfor a distance of 1000 to 3000 ft. on either side the crossing andinsulated for battery- and bell circuit, a battery being necessaryat each end of the bonded track and one at foot of beU post. Average cost for installing crossing gates §700 Expense of flagman per annum, averages 600 Installing signal beUs, each averages 500 Annual maintenance for each bell 100 Cost of installing gate protection, averages 475 Cost of installing automatic flagman, averages 600 Annual maintenance charge for each, averages 100 A--a-6 Volt S Lampe Bee Detail X-IS-U. Xote:-Bell to beplaced on sideof post facinghighway
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Keywords: ., bookauthororrockjohnwilson1870, bookcentury1900, bookdecade1910
