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Home > Science, Technology & Agriculture > Technology: general issues > An Elementary Class-Book of Practical Coal-Mining; For the Use of Students Attending Classes in Preparation for the Board of Education and County Council Examinations or Qualifying for First or Second Class Colliery Managers' Certificates
An Elementary Class-Book of Practical Coal-Mining; For the Use of Students Attending Classes in Preparation for the Board of Education and County Council Examinations or Qualifying for First or Second Class Colliery Managers' Certificates

An Elementary Class-Book of Practical Coal-Mining; For the Use of Students Attending Classes in Preparation for the Board of Education and County Council Examinations or Qualifying for First or Second Class Colliery Managers' Certificates


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About the Book

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. 1907 Excerpt: ... plan: a is an electric motor of about 12 horse-power; b is the chain jib which is attached to the back of the machine; it consists of two steel plates, kept apart by distance pieces; the endless chain runs between these plates, and is driven by the sprocket wheel c, which is driven by the motor, and passes round a wheel at the end of the jib. The jib is free to swing right round the end of the machine, this movement being controlled by gearing (not shown in the figure) to enable the machine to cut its way into the coal. The machine does not travel along the face on wheels, but upon a pair of iron plates or sledges. It can be raised or lowered on these sledges by means of the four screwjacks, d, d, which are worked by worm-wheels driven by the motor. In order to keep the machine up to the face, the jib is set at an acute angle to the frame when making a cut, as shown in sketch. The iron fender e prevents the machine from being dragged into the coal. This arrangement does away with the trouble of laying rails along the face, and saves a couple of inches of height, but more power is required to pull the machine along. The newer machines are being made with a plough blade to take the outer thrust by cutting a groove in the floor. The propelling gear consists of the vertical drum, /, and guide wheels. The end of the rope is led round the fixed pulley and back to the jib, so that the cutters have a direct pull against the coal. The drum is driven through a friction clutch, and can be thrown out of gear without stopping the chain. The cutters are secured to the chain by set-screws, and are splayed out to make the cut sufficiently wide to admit the jib. The ordinary width of the cut is about 4 inches. Working Coal by Machines.--There are two general principles upon..


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Product Details
  • ISBN-13: 9781236217226
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 114
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1236217225
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 218 gr


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An Elementary Class-Book of Practical Coal-Mining; For the Use of Students Attending Classes in Preparation for the Board of Education and County Council Examinations or Qualifying for First or Second Class Colliery Managers' Certificates
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An Elementary Class-Book of Practical Coal-Mining; For the Use of Students Attending Classes in Preparation for the Board of Education and County Council Examinations or Qualifying for First or Second Class Colliery Managers' Certificates
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