Abstract
AMONG the most exquisite tools that modern wireless telegraphy now proffers to investigators working in the fields of pure science, that known as the amplifier stands out as being of the most obvious promise in various directions. The amplifier offers the means of magnifying varying electro-motive forces and currents, otherwise imperceptible, so that they come within the range of ordinary laboratory measuring and recording instruments. It was developed during the war to a high pitch of excellence, not only for the improvement of wireless telegraph signals, but also for other kinds of signalling and for listening under water and under the ground-that is to say, it has been fully developed for the magnification of the high-frequency currents used in wireless telegraphy and for currents of telephonic frequency. Descriptions of the apparatus have now been published in many places, and the tool as thus developed will in due course take its place in the laboratory. For many purposes, however, an amplifier that will faithfully magnify slow variations of a current or electro-motive force is demanded, and since little has been published about such apparatus, the following notes of methods used in the writer's laboratory during the past few years are now. presented.
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ECCLES, W. Triode Valves as Electric Amplifiers . Nature 104, 501–502 (1920). https://doi.org/10.1038/104501a0
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DOI: https://doi.org/10.1038/104501a0