A Handbook of the Manufacture and Proof of Gunpowder, as Carried on at the Royal Gunpowder Factory, Waltham Abbey

A Handbook of the Manufacture and Proof of Gunpowder, as Carried on at the Royal Gunpowder Factory, Waltham Abbey

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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. 1871 edition. Excerpt: ...after the operation was over. These machines are both clumsy and dangerous. The last one in use at Waltham Abbey was destroyed by the fatal explosion in 1843, since which time none but the new granulating machines of Congreve have been employed. These machines are found to be perfectly safe, and to give very good results as regards per-centage of grain obtained from them. This is particularly the case with the small-grained powder used with small arms, and also to a somewhat less extent with the R.L.G. Larger powders than the latter have hitherto been made by throwing the press cake on a table and breaking it up by hand with mallets, but there is little doubt that arrangements and alterations might be made in the machines, so as to enable them to granulate powders of any size of grain. The granulation is effected by passing the press cake between revolving toothed rollers of gun metal. The newest machine at the Royal Gunpowder Factory (see Plates 18 and 19) contains four pairs of such rollers, arranged in a slanting direction, one above the other. These rollers are set in the two strong side frames of gun metal which form the framework of the machine. Each pair is adjusted at the proper distance apart by set screws; but the back roller of each pair works in a sliding bearing which is kept up against the bearing of the other roller by a weighted lever, so as to admit of the rollers opening out and admitting an excess of material to pass through without injury to the machine. The two upper pairs of rollers have coarser teeth than the lower pairs. Slanting rectangular sieves or screens are placed from underneath each of the three upper pairs of rollers to the top of the next, to convey any fragments which escape proper crushing in one pair...show more

Product details

  • Paperback | 56 pages
  • 189 x 246 x 3mm | 118g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236569571
  • 9781236569578