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Home > Art, Film & Photography > Repertory of Patent Inventions and Other Discoveries and Improvements in Arts, Manufactures and Agriculture (Volume 14, Nos. 90-96)
Repertory of Patent Inventions and Other Discoveries and Improvements in Arts, Manufactures and Agriculture (Volume 14, Nos. 90-96)

Repertory of Patent Inventions and Other Discoveries and Improvements in Arts, Manufactures and Agriculture (Volume 14, Nos. 90-96)


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About the Book

This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1833. Not illustrated. Excerpt: ... Description of an Apparatus, used as a substitute for the Lewis in raising heavy Stones. By William Howard, Civil Engineer. The M'Kim school now erecting in Baltimore by the liberality of a public-spirited individual, is to be an exact copy, as to the portico, of the celebrated temple of Theseus at Athens, and of the precise size of the original. The body of the building is composed of blocks of granite ashler, from Ellicott's mills, each course being of the same height. To permit these blocks to be placed with accuracy and convenience, it was necessary to suspend each one in such a manner as to leave its bed and sides entirely free. The Lewis with two pins, represented in fig. 1, and similar to one described in Rondelet, Art de Batir, was tried, and found to succeed very well, requiring only two holes to be bored about three inches deep, which can be done in the granite with great facility. Still it was desirable to avoid the labour of fitting this Lewis to more than 400 blocks, and the contrivance represented by fig. 2, was invented for the purpose, and has been found to answer perfectly. It consists of an iron bar, bent in the form A b c tr, and of a size proportionate to the blocks of ashler intended to be raised. At c a mortise is made through it, admitting freely the bar H E. This bar is pierced with holes, as shown in the figure, through one of which an iron pin is put, to prevent it from slipping towards h. At F is a plate attached to this bar, between which and the ashler block G, a piece of wood is placed to keep the iron from injuring the worked face of the block. The end d forms a steel pin, which may be inserted about an inch into a hole bored into the block; but in cases where the least projection or shoulder can be found for this point to catch ho...


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Product Details
  • ISBN-13: 9781235199653
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 132
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 1235199657
  • Publisher Date: 13 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 249 gr


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Repertory of Patent Inventions and Other Discoveries and Improvements in Arts, Manufactures and Agriculture (Volume 14, Nos. 90-96)
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