Show DANGER SIGNAL AT CROSSING Startling Automatic Device Gives Gives Warning of Approaching Trolley Car at Crowded Corner Where three streets come together at one place the crossing is sure to tobe tobe tobe be dangerous particularly if trams traffic is heavy and there Is s a trolley line A startling danger signal has been Invented for such a crossing It 1 on em a corner that the cars pass and Is Isso Isso isso so connected with the track that when r f x r t b A I J f i SHW Tv 48 Arm at Top of Signal 1 Post Revolves and nd Large Gong Sounds at Approach of Trolley Car a s car approaches the arm at the top revolve revolved Into an outstretched position and a largo large gong sounds The signal Itself it painted in startling colors like a camouflaged ship Pop Popular lar Science Monthly |