McLain's System of Reading Working Drawings or Blue Prints

McLain's System of Reading Working Drawings or Blue Prints

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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. 1921 edition. Excerpt: ...placed about 6 or 7 feet to the right of this opening, running parallel with the ovens. On this track coal is conveyed from the screens or washery to the openings of the ovens. The largest size ovens are capable of holding a charge of about 5 ton which is introduced thru the opening at the top and is leveled olf to a height of about 21/2 feet. The brickwork of the walls and roof being still red hot from the previous charge, ignites the gases. Air is admitted thru openings in the upper part of the door. When the gas is burnt ofi, the upper part of the door is opened and the glowing charge cooled by jets of water thrown directly upon it from a hose, and it is subsequently drawn out thru the open door. The charge breaks up into prisms or columns the length of which corresponds to the depth of the charge, and as a rule is uniform in character and free from dull black patches or "black ends." The time for burning is either 48 or 72 hours. The longer the heat is continued the denser the product becomes, but the yield also diminishes, as a portion of the finished coke necessarily burns to waste when the gas is exhausted. For this reason the yield on the coal charged is usually less than that obtained in retort ovens, altho the quality is better. Coals containing at most about 35 per cent volatile matter are best suited for the beehive oven. With less than 25 per cent the gas is not sufiicient to effect the coking completely, and when there is a higher percentage the coke is brittle and spongy and unsuited for blast furnace or foundry use. The spent flame from the ovens passes to a range of steam boilers before escaping by the chimney. 1. Fig. 100. (a) How many ribs are there in the inside of this piston? (b) What is the more

Product details

  • Paperback | 44 pages
  • 189 x 246 x 2mm | 95g
  • United States
  • English
  • black & white illustrations
  • 1236812719
  • 9781236812711