A Key to Mine Ventilation

A Key to Mine Ventilation

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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. 1892 edition. Excerpt: ...improvement is also applicable to the Schiele fan and to all other types of closed fans. In a case (personally known to me ata colliery where there are two uibal fans, one 30' x 10' and supplied with one of the shutters, whilst the other one is 21' x 8' and without a shutter, the effect of the working of the two machines is very different. In the case of the larger fan there is no vibration, tlfe whole machine working ('uite smoothly at 60 revolutions per minute. With the smal est fan, at the same speed, there is a distinct vibration at each revolution, and so much so that the windows in a house situated at a distancc of 340 yards cause a constant rattle--due to the heavy vibration of the fan. The cost of lputting in one of these to an existing fan in England 30' x 0' will be about 50.0.0. It may be interesting here to mention that, amongst the many fansto which this patent has been fitted are the ventilating fans (two 30 feet and two 40 feet diameter) constructed and erected by the patentees for the ventilation of the tunnels under the river Mersey at Liverpool. It has also been applied to the machinery for ventilating the Severn Tunnel. ' At the recent exhibition of mining machinery held at Newcastle-on-Tyne, the only gold medal awarded amon several hundred exhibits in the mining section was granteg to this patent. The following readings were taken from a 24-feet Guibal fan (erected some years ago) after the aptplication of this invention: The slight decrease in the use ul effect at the high speeds is due to the contracted evase of the chimney (which is constructed to Guibal's original dimensions) the effect being to cripple the free passage of the increased volume of air into the...show more

Product details

  • Paperback | 46 pages
  • 189 x 246 x 3mm | 100g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236811674
  • 9781236811677