Signalling through space without wires : being a description of the work of Hertz & his successors . reading. That a spark occurring 15ft. away shouldcause a shock to a person in an independent circuit excitedmy wonder; it was inexplicable and yet so certain to occurthat I was obliged to abandon the use of the two pieces ofapparatus at the same time. 112 SIGNALLING WITHOUT WIRES. At last, when time permitted, I set out to investigate. Isought for an ordinary induction circuit of parallel wiringand found none. I then suspected the microphonic rheostatof pulverised carbon and having cut it out o
Signalling through space without wires : being a description of the work of Hertz & his successors . reading. That a spark occurring 15ft. away shouldcause a shock to a person in an independent circuit excitedmy wonder; it was inexplicable and yet so certain to occurthat I was obliged to abandon the use of the two pieces ofapparatus at the same time. 112 SIGNALLING WITHOUT WIRES. At last, when time permitted, I set out to investigate. Isought for an ordinary induction circuit of parallel wiringand found none. I then suspected the microphonic rheostatof pulverised carbon and having cut it out of circuit Isubstituted for it a water rheostat. The phenomena nowfailed to occur. Replacing the carbon rheostat and puttinga telephone in circuit I adjusted the milliammeter to read2 milliamperes, causing an assistant to evoke the distantspark. All was now clear. At each spark the needle jumpedforward and a distinct telephone click was heard from thetelephone receiver. I observed that the first jump of theneedle was the longest as well as the first click in the receiver STREET MAIM 16 C. P. LAMP. 8TATIO INFLUENCE MACHINE / MILL1AMPERE METER 5jj* PULVERIZED ™ CARBON RHEOSTAT TELEPHONE RETURN CIRCUIT
Size: 1381px × 1809px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidsi, booksubjectelectricity
