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Show New Safety Signal Syetem. A new safety slpnal system, described de-scribed In Popular Mechanics Maga-sine, Maga-sine, and developed with especial reference ref-erence to the requirements of coal mines and other underground workings, work-ings, but applicable to many operations opera-tions above ground, has for Its principal princi-pal feature a combination of bell and Hltht signals, operated from the same electric circuit. Mounted so as to be in plain view of the hoisting engineer from his station, Is a bell to which Is attached a colored lamp that lights at the same time the bell rings on signal from one of the mine stations. Another lamp on the bell base indicates indi-cates to the engineer that the system sys-tem Is operating when he wants to repeat a signal or to give one, for which purpose he Is supplied with a conveniently located circuit closer. |