Show Electric Eyes to Guard Lift Riders I Pittsburgh Pa Electric eyes will guard users of ot elevators elevators ele ele- ele- ele I I In Rockefeller Center New York Light beams are re to be projected projected projected pro pro- across elevator entrances entrances en en- trances In such a way any person person per per- I son Intercepting them will cast casta i a 11 shadow on a electric photo cell The cell controls operation of the doors and the falling shadow will ke keep p them open or shoot them bac back If It they have started to close when a passenger passenger ger Is IB stepping In or out of the car cur |