The Miner's Handbook; A Handy Book of Reference on the Subjects of Mineral Deposits, Mining Operations, Ore Dressing, Etc. for the Use of Students and Others Interested in Mining Matters

The Miner's Handbook; A Handy Book of Reference on the Subjects of Mineral Deposits, Mining Operations, Ore Dressing, Etc. for the Use of Students and Others Interested in Mining Matters

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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. 1893 edition. Excerpt: ...36-00 34.79 6 18.00 17.37 12 9.00 8.71 24 4-5 4-33 For velocities of 3 feet per second. 3 81.00 71.28 6 40.50 35.85 12 20.25 17-89 24 10.12 8.98 For velocities of 7 feet per second. 3 441 335-28 6 220.50 197-7 12 110.25 83.95 24 55.12 41.82 A general formula given by Merivale is.#=head of water in feet required to overcome resistance. 7=gallons per minute. L = length of pipe in yards. =diameter of pipe in inches. Classiiication oi Pumps.--Michel! gives the following classification of steam pumps. I. Horizontal Eng1nes. It will be observed that all pumps with their engines in the above classification form one machine, whereas the Cornish engine and its pumps are separate machines. The Bull engine is a Cornish engine working directly over a shaft and therefore direct acting.. In this case the pumps are also adjuncts to the engine. The objection to Bull engines is that they block up the shaft. Fuel A cornish engine requires about 3.5 Ibs. of coal per H.P. A common,, 5 A high pressure engine requires about 10 Ibs. of coal per H.P. A small high pressure engine requires about 15 to 20 Ibs. of coal per H.P. Unty of Pumps (Michell), At the Tynewydd Collierya "Special " (steam cylinder 12," water cylinder 10" stroke 18") consumed about 14 cwts. coal to raise 300 tons of water 66 feet. This equals a duty of 3,168,000 Ibs. raised 1 foot by 1 cwt. of coal and allowing for loss of heat say 4,000,000 Ibs. which is 1/2O of the duty of a Cornish engine. A Cornish engine will give a duty of 95,750,000 Ibs. raised 1 foot, by burning 1 bushel of coal (94 Ibs.) or 114,000,000 Ibs. for 1 cwt. of coal, or 33 times that performed by the above "Special." Mr. John B....show more

Product details

  • Paperback | 102 pages
  • 189 x 246 x 5mm | 195g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236795822
  • 9781236795823