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Scientific American, Vol. 62, No. 18 (May 1890) (1890)
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pneumatic pipes, admits compressed air to the the circuit is completed, and the semaphore descends to the other hole in the locking bar, N. actuating cylinder and piston, and throws the switch to "safety." When the switches are to be changed, the Referring to the sectional view, H is the locking… … These, with their Fig. 2.-ELECTR0-PNEUMATIC INTERLOCKING SWITCH AND SIGNAL STATION AT PITTSBURG, PA. © 1890 SCIENTIFIC AMERICAN, INC.Potash · Cobalt · Patents · Munn · Chlorate · Scientific American · Triassic rocks · Time sheet · Potash chlorate · Horse power · Hudson river · Express money · Potash permanganate · Gun cotton · Free ends
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