Notices on the Models, Charts and Drawings Relating to the Works of the Ponts Et Chausees and the Mines; Prepared for the Universal Exhibition at PH
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Home > Art, Film & Photography > Notices on the Models, Charts and Drawings Relating to the Works of the Ponts Et Chausees and the Mines; Prepared for the Universal Exhibition at PH
Notices on the Models, Charts and Drawings Relating to the Works of the Ponts Et Chausees and the Mines; Prepared for the Universal Exhibition at PH

Notices on the Models, Charts and Drawings Relating to the Works of the Ponts Et Chausees and the Mines; Prepared for the Universal Exhibition at PH


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About the Book

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. 1876 edition. Excerpt: ...carrying the block is hooked on to a cable which forms the running end of a tackle with six sheaves, placed vertically in a frame i5 metres in height. The movable pulley carries a counter-poise, which rises as the truck descends the inclined plane. The counter-poise causes the empty truck to ascend, as soon the pontoon has received the block. In the descent, the difference between the traction strain and the resistance of the counter-poise, is regulated by a screw brake acting on a cast iron drum, round which the cable winds. The inclined plane is go metres in length, and its slope varies from 55 to 80 millimetres per metre, so as to equalise the traction strain exercised by the block in its descent, whatever may be the lightening effect produced by its gradual immersion in the water. Naval material.--Two pontoons, connected by sidebeams, are generally employed for sinking the blocks (sec drawings). A space of 3 metres is left between them, and they are connected by strong balks of timber, to which the block is suspended by a hook with a trigger, details of which are given in the drawings. But when it is a question of placing the blocks at the foot of the wall, in order to approach it with greater facility, a large pontoon is employed, which carries the block at one end, and is ballasted at the other, in such a manner as to preserve the line of flotation, when the pontoon is loaded. For sinking the natural blocks, bridged boats were used, and the blocks were placed on the bridge, which inclines sufficientlv from each side of the longitudinal axis of lho boat, and is retained there by the doors, which are lowered when the boat arrives at its destination. At the present time, a boat completely bridged is employed, in the centre of which is...


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Product Details
  • ISBN-13: 9781150868436
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 94
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1150868430
  • Publisher Date: 01 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 181 gr


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Notices on the Models, Charts and Drawings Relating to the Works of the Ponts Et Chausees and the Mines; Prepared for the Universal Exhibition at PH
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Notices on the Models, Charts and Drawings Relating to the Works of the Ponts Et Chausees and the Mines; Prepared for the Universal Exhibition at PH
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