The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 29
e E.M.Fs. induced in it. We have thus accomplished our object,for we have made the primary circuit of low resistance, the transmitteritself being the principal item, and thus variations in the resistance of thetransmitter are not masked by a large constant resistance. To put thematter plainly and… … FlGURE 6. lion in the quantity of water in the pond, whereas in the former case wemay cause the small bowl to overflow. Professor Hughes, in May, 1878, read a paper before the Royal Societywhich greatly added to our knowledge of the subject of telephony.Professor Hughes disco\fered that any system…
Telephone · Postal service
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