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Home > Art, Film & Photography > Amongst Machines; A Description of Various Machanical Appliances Used in the Manufacture of Wood, Metal, and Other Substances. a Book for Boys
Amongst Machines; A Description of Various Machanical Appliances Used in the Manufacture of Wood, Metal, and Other Substances. a Book for Boys

Amongst Machines; A Description of Various Machanical Appliances Used in the Manufacture of Wood, Metal, and Other Substances. a Book for Boys


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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: Chapter II. (RON. HIS substance has been occasionally found as a metal more or less pure, but more generally in the form of ironstone or iron-ore, in which the metal is combined with several substances requiring to be separated from it. A lump of ironstone would appear to a casual beholder like a heavy pebble; and many a boy would think nothing of shying it away at any object that might offer itself as a mark, without a moment's consideration, and certainly without any suspicion of its? real value. The reader must not suppose that this iron-ore is always alike, or that there is but one quality; and it may seem at first strange that the greater part of that which is worked in England is comparatively poor in the quantity of metal which it contains. This is the argillaceous (clayey) ironstone, in which the metal is mixed withclay, lime, magnesia, and sometimes with bitumen, -when it bears the name of black-band, and is of better quality. This is a carbonate of iron, carbon being chemically associated with it. The reason that this kind of ironstone is so largely used is that it occurs in vast quantities in the Coal Measures of England, Providence having placed side by side the ore and the material required for smelting it. The richest in metal is the ore called magnetite?the magnetic oxide of iron? next to which is red haematite, and then brown haematite. These occur chiefly in Sweden, but also in great quantities in different parts of England. Here again, as notably in the Forest of Dean, Gloucestershire, the coal (and timber for charcoal) is close at hand, which has of course in a great degree determined the chief localities of the iron manufacture. Unless the ore is particularly pure, it is first of all roasted, either by laying it in heaps with the necessary fuel ...


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Product Details
  • ISBN-13: 9780217809320
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 68
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 0217809324
  • Publisher Date: 12 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 141 gr


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