Signalling through space without wires : being a description of the work of Hertz & his successors . Syntonic Sender and Receiver used in the experiments plotted onpage 28. The switch enables the coherer K to be connected either to thetuned resonator M L N or to the detecting circuit E F. Weak impulsesare felt when the switch is C E, D F ; strong impulses when the switchis C A, D B ; provided the coil L is similar to the coil of the radiatorabove. The impulses are plotted in the diagram Fig. 19a. 28 SIGNALLING WITHOUT WIRES. joined to the coherer circuit through one of the usual smalltransform
Signalling through space without wires : being a description of the work of Hertz & his successors . Syntonic Sender and Receiver used in the experiments plotted onpage 28. The switch enables the coherer K to be connected either to thetuned resonator M L N or to the detecting circuit E F. Weak impulsesare felt when the switch is C E, D F ; strong impulses when the switchis C A, D B ; provided the coil L is similar to the coil of the radiatorabove. The impulses are plotted in the diagram Fig. 19a. 28 SIGNALLING WITHOUT WIRES. joined to the coherer circuit through one of the usual smalltransformers—a plan which has many obvious advantages. The fluctuations of resistance of a coherer dependent onvarious strengths of stimulus are instructively shown in somemetrical experiments made by Mr. Robinson, and a plottingof which I showed to the Physical Society of London in1897. This plotting is here reproduced, and it shows thesingular fact that, whereas a stronger electrical stimulususually decreases the resistance, as is natural, a weaker subse-quent stimulus usually increases it again : so
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