Ioo

17,200 18,600 18,420 18,030 17,600 •See S. P. Thompson, The Electromagnet (London, 1891); J. A. Fleming, A Handbook for the Electrical Laboratory and Testing Room, vol. 2 (London, 1903); J. A. Ewing, Magnetic Induction in Iron and other Metals (London, 1903, 3rd ed.). sample of forged ingot-metal for dynamo magnets. No. IV. is a steel casting for dynamo magnets, unforged, made by Messrs Edgar Allen & Company by a special pneumatic process under the patents of Mr A. Tropenas. No. V. is also an unforged steel casting for dynamo