Industrial History of the United States, from the Earliest Settlements to the Present Time; Being a Complete Survey of American Industries Together with a Description of Canadian Industries

Industrial History of the United States, from the Earliest Settlements to the Present Time; Being a Complete Survey of American Industries Together with a Description of Canadian Industries

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1889 edition. Excerpt: ...and ground when cold by rolling in a barrel with zinc balls. The ingredients are all reduced to powder: they are then mixed in the proper quantities, and sent to the grinding-mill in quantities of about fifty pounds at a time. The incorporation of the ingredients is a very important matter, and the grinding, is therefore, very carefully attended t0. It takes place in a circular trough of cast-iron, in which cast-iron wheels of three or four tons' weight follow each other slowly around in a circle, crushing the powder under them as they pass along. The powder is kept moistened throughout the operation. After grinding, the powder is subjected to heavy pressure between copper plates, and is thus reduced to a cake. It is then broken up into grains, either by mallets or t00thed rollers, glazed by rolling in barrels so as to enable the grains the better to resist moisture, dried, sifted, and cleaned of dust. The relative proportion of the ingredients causes the powder to burn slowly or rapidly. This idea was taken advantage of by Gen. lBnition of Rodman, U.S.A., in 1856, in order to produce a powder suited powder, to large cannon. He conducted a series of experiments with eter" powders, and was the first in the world to produce an explosive suited to modern artillery. His powders were made in two forms. One, called the "mammoth," was in irregular grains, from six-tenths to Rodman. nine-tenths of an inch in diameter: the other, called the "perforated cake," was in hexagonal or cylindrical grains, perforated with six 01 ten holes. Gen. Rodman gained slow combustion by these varieties of powder, and consequently greater initial velocity at the mouth of the gun, with less recoil. The heavy guns used in the war of 1861 were supplied...show more

Product details

  • Paperback | 368 pages
  • 189 x 246 x 19mm | 658g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236623819
  • 9781236623812