. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . continuous circuits. The storage batteries whichgong to sound in both signal cause the red lamps to light up are care-towers and lights 174 red fully maintained, and the proof of itslamps rangedalong each sideof the tunnel. The returnof the plug toits place in thebox will not ex-tinguish thelights nor willit stop the ring-ing of the towergongs. The reason for thisis that as the lighting andbell circuit is turned on bythe fall of a heavilyweighted solenoid core, theremaking of the plug boxor a
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . continuous circuits. The storage batteries whichgong to sound in both signal cause the red lamps to light up are care-towers and lights 174 red fully maintained, and the proof of itslamps rangedalong each sideof the tunnel. The returnof the plug toits place in thebox will not ex-tinguish thelights nor willit stop the ring-ing of the towergongs. The reason for thisis that as the lighting andbell circuit is turned on bythe fall of a heavilyweighted solenoid core, theremaking of the plug boxor circuit will notenergize the soenoids suf-ficiently to raise the cores,though this current willhold them up when theyhave been put back inplace. The tower signal-men at the eastern portalafter receiving full expla-nation and authority from the repair gangforeman are the only ones competent toextinguish the lights or quiet the rule of the company the lighting ofthe danger lamps in the tunEel absolutelyprohibits train movement in either direc-tion until the warning glow dies EASTERN ENTRANCE TO THE OXFORD TUNNEL ONTHE D., L. & W., SHOWING TRACKS CONVERGING. continual efficiency is had by causing it,as a matter of test, to light up both, in-terlocking towers every night. A test ofthe light is made every 24 hours, withrecord of voltage, amperage and batteries are charged from the citylighting station every week with current 254 RAILWAY AND LOCOMOTIVE ENGINEERING June, 1904. which, passing through suitable rheo-stats, gives the exact strength necessaryto chemically separate the elements ofthe storage battery. The sulphurous and carbonic acidgases which are constantly in the tunnelhave a most destructive action on all a piece of gauntleted track runningthrough it. The corresponding railsof each track approach within 7ins. of each other. An arrangement ofthis kind, while it has the advantage ofeconomical tunnel construction, practi-cally contracts
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