Excerpt from The Electrical Engineer, Vol. 8: A Weekly Journal of Electrical Engineering, With Which Is Incorporated "Electric Light"; From July 3, 1891, to December 25, 1891
The decision with reference to the Birming ham electric tramways and the telephones shows conclusively that the telephone companies will fight under the aegis of vested interests to obtain the monopoly of earth return. The man in possession is a most difficult individual to deal with. Morally, his right may be objectionable, but practically he laughs at all opponents. The earth as a return seems naturally to come under the head of common property, just as the air we breathe; but currents do interfere with each other, and no doubt heavy currents, such as are used in tramway work, or in lighting, cannot use the same earth as telephone or telegraph currents. The case stands thus: In many places telephones have been installed, and in the majority of instances, when installed, the earth is used as the return part of the circuit. The telephone companies are private adventure concerns, and whatever profits arise go into the hands of shareholders and are not common property to the whole community like telegraphic profits. Royalty to the Telegraph Department, and so may be looked upon as a benefit to the community, but otherwise, as we say, the adventure is one of a purely private character. Tramway work, electric lighting, electric transmission of power, are also private adventures, and from the moral point of view these adventures have just as much right to use an earth return as the telephone.
In no case, however, is an earth return better than a metallic return, and it is only used to save money; and this, so far as telephony is concerned, is usually saved at the expense of time and temper. The best telephone circuits are those wholly metallic. It is argued, however, that initial saving is of the utmost importance in the early stages of an industry, and that the development of telephony would be greatly retarded by insisting on the use of metallic circuits Some eminent telephone engineers dispute this, and contend that in all instances the complete metallic circuit is the best.
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