A Memoir of Suspension Bridges: Comprising the History of Their Origin and Progress, and of Their Application to Civil and Military Purposes, with Descriptions of Some of the Most Important Bridges; Viz. Menai, Berwick, Newhaven, Geneva, Etc. Also an Account of the Experiements of the Strength of Iron Wires and Iron Bars, and Rules and Tables for Facilitating Computations Relating to Suspension Bridges

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Longmans, Rees, Orme, Brown, Green & Longman, 1832 - Bridges - 211 pages
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Page 3 - at least nine or ten times crossed to make it " secure. " This collection of ropes is traversed by a block " of wood, hollowed into a semicircular groove, large " enough to slide easily along it ; and around this " block ropes are suspended, forming a loop, in which " passengers seat themselves, clasping its upper
Page 3 - beam of wood is fixed horizontally " upon or behind two strong stakes, that are driven " into the banks on each side of the water, and round " these beams ropes are strained, extending from the " one to the other across the river, and they are " hauled tight, or kept in their
Page 210 - For piers, or jetties on the sea coast, they appear to be peculiarly adapted, from the openness of their construction. If the suspension towers are founded on piles, and themselves made of strong but open framework, and if the chains and platform are properly combined to get as much
Page 3 - with their hands, to keep themselves steady. " A line fixed to the wooden block at each end, " extending to each bank, serves to haul it and the " passenger attached to it from one side of the river " to the other.
Page 49 - length can, by means of temporary scaffolding and " iron chain bars, be readily constructed and fixed " upon the masonry offsets of the abutment, and to " horizontal iron ties laid into the masonry for this " purpose. A set of these frames (four in number) " having been fixed against the face of each
Page 3 - awful way, and the ropes, though they decline in " the centre to the water, are elevated from thirty to " forty feet above it. The span is from ninety to " a hundred yards.
Page 50 - second portion of framework is suffered to " descend to its intended position by means of the " suspending chain bars, until it closes with the end " of the previously fixed frame like a rule joint.
Page 49 - with planking, and the whole converted into " a platform 50 feet by 40. By the nature of the " framing, and from its being secured by horizontal " and suspending bars, I presume every person
Page 49 - to practical operations will admit that these " platforms may be rendered perfectly firm and " secure. " The second portion of the centering frames " having been previously prepared and fitted together
Page 22 - The momentum or energy of a body falling through the atmosphere is the mass or weight, multiplied by the square root of the

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