The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 20
nt is surrounded by a magnetic field. This magnetic field we repre-sent by lines of force, as shown in Figure i. If we wish to increase this * Lodges Modern Views of Electricity contains a non-mathematical and thoroughlyreadable account of these ideas. Production of Electric Currents. 5 magnetic… … This results in an increased number of lines of force, as every added inchof wire adds its lines to those already there. The necessity for bringingthe wire together is merely to concentrate the effect. There are many ways in which an electric current can be produced.Firstly, there is the chemical…
Telephone · Postal service
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