ergy necessary for the production of a ton of metal penditure of energy of 2°7 horse power hours per kilo- the magnetic field as a result of the common action of is estiinated at 3,000 horse power hours. The following gramme. The numerous tests carried out under these the electro-magnets. table… … tained in the pitch must be also taken into account. It will require, then, 1,600 calories to reduce the 1,000 kilos. of iron contained in the magnetic ‘oxide, and 400 calories to to multipolar machines with a double circuit, with melt the resulting mass, or a total of 2,000 tubular cores of…
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