Professor Elihu Thomson's Recording Wattmeter circa 1883

Catalogue number #658530487

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Description:

Supplying electricity was one problem charging for it by use was another. The first attempt to do this was an electric "clock" meter devised by Professors Ayrton and Parry in 1882, whose pendulums were electro-magnetically controlled. Two electric clocks were mounted on the same base plate. The last wheels in the train of each clock were so geared together that if the clocks were going at the same rate the counting dials were not affected. If however one clock gained on the other, the dials registered the gain. If one clock was made to err at a rate proportional to the Watts, the total error was proportional to the watts consumned in a given time and thus the indicated the energy. This was neither a simple or a really practical solution to the problem of mass metering electricity supplies. The next solution was devised by Professor Elihu Thomson which was in reality a small electric motor, so controlled that the speed of rotation of the armature is proportional to the power supplied, and therefor the total number of revolutions of the armature, which can be automatically counted quite easily, measure the total energy. Most electricity meters used this system for the next century. Professor Elihu Thomson's electricity meter offered here made by British Thomson Houston Co Ltd. London was manufactured in France. With its magnificent glass case it seems designed for collectors of early electric motors in the twenty-first century. In virtually mint condition this must be one of the most elegant electric motors ever produced. Case diamensions height 10.6" (27 cm) base front to back 8.5" (21.5 cm) width 8.9" (22.5 cm). Delivery at cost

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