Platers' Guide; With Which Is Combined Brass World Volume 1

Platers' Guide; With Which Is Combined Brass World Volume 1

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ...of the method of reducing manganese ore by the use of aluminum, pure manganese was a very expensive metal. Although it has now become greatly reduced in price from that which was formerly charged, it is still somewhat expensive. Today pure manganese costs in the neighborhood of seventy cents per pound. This naturally places it beyond the possibility of use in cheap mixtures unless very small quantifies are used. Its use in resistance wire, therefore, which contains from twenty to thirty per cent. of manganese renders the cost of the mixture too high for commercial use. It is the opposite with ferro-manganese, as this material is quite cheap. If purchased in large lots, it may be bought for about four cents per pound. This price naturally makes it attractive to those who contemplate the manufacture of manganese alloys, and a number of years ago the writer fully believed that it could be employed for the manufacture of a cheap resistance wire for electrical purposes at a less cost and of a higher resistance than german-silver. A long series of experiments were made, and a large quantity of wire was manufactured from manganese-copper in which ferro-manganese was used. At first, the method seemed to hold out much promise; but difficulties were met which seemed at that time unsurmountable and prevented the sale of the wire. If these could be overcome ferromanganese might be used, but up to the present time no further progress has been made in this direction. The experiments were very instructive, however, and it may be of interest to give the results. If copper and ferro-manganese be melted together in a crucible, they unite as soon as the heat becomes high enough to melt the be borne in mind, though, that all the carbon is practically changed...show more

Product details

  • Paperback
  • 189 x 246 x 11mm | 358g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236887336
  • 9781236887337