Transactions - North of England Institute of Mining and Mechanical Engineers Volume . 30

Transactions - North of England Institute of Mining and Mechanical Engineers Volume . 30

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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. 1881 edition. Excerpt: ...going through coal, and he wished to know from Mr. Jefferson if there would not be the same difficulty with the new borer. He would also like to have some particulars as to the cost of boring. Mr. Leeoue said, he could confirm the Chairman's statement as to the Diamond Boring and its occasional faulty indication with respect to coal. He had a strong proof of that two years ago, when he delivered a lecture on "Coal and Coal-getting" at the annual congress of the Gas Managers' Association. He happened to mention that in boring with the Diamond apparatus, in some cases coal had been gone through with little or no record of it, and this, he thought, might be attributed to the action of the water. That lecture was fully reported in a good many papers, and he afterwards received a letter from an official of the Diamond Boring Company on the subject. He had praised the Diamond Boring system very much in the course of his lecture; for this his correspondent thanked him, but added that he was very sorry for what he (Mr. Lebour) had said as to the defects of the system when recording coal, and stated that whenever they came to coal they ceased boring with the Diamond and used the ordinary apparatus. The writer of the note also remarked that experienced borers knew by the touch of the rods what they were going through to a certain extent. The depth indicated by the cores and debris raised by the Diamond apparatus was very great in the Sub-Wealden boring, which was sunk with the greatest care; but there, owing to the large amount of soft rock and clay, it was found that, on the average, for every 15 feet of rock bored through, they got only 14 feet of core. With that before them, they had a proof that the process was not a perfect more

Product details

  • Paperback | 104 pages
  • 189 x 246 x 6mm | 200g
  • United States
  • English
  • black & white illustrations
  • 123677812X
  • 9781236778123