WILLIAM HARKNESS. BY MARCUS BENJAMIN WILLIAM HARKNESS. Fig. FOR PUTTING LOCOMOTIVE IN COMMUNICATION WITH WATCH TOWER. APPARATUS FOR PREVENT TRAINS. a clockwork movement revolves a cylinder over which passes a Fig. FOR REGISTERING THE - RUNNING OF -TRAINS., scientific american, 1893-09-23
WILLIAM HARKNESS. BY MARCUS BENJAMIN WILLIAM HARKNESS. Fig. FOR PUTTING LOCOMOTIVE IN COMMUNICATION WITH WATCH TOWER. APPARATUS FOR PREVENT TRAINS. a clockwork movement revolves a cylinder over which passes a Fig. FOR REGISTERING THE - RUNNING OF -TRAINS., scientific american, 1893-09-23
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