The Iron Age Paper Read Before the San Francisco Chapter American Institute of
The Iron Age Paper Read Before the San Francisco Chapter American Institute of
G H Sanders
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See next illustra- tion. But the next example is altogether different in material, if material used, as it is unnecessarily heavy and expensive, not in form. Until recent years, stone, brick or timber was the material almost always employed in the construction of bridges; but late in the last century cast iron began to be employed, and the specimen here shown Southwark Bridge over the Thames, 240 foot in span of arch, is not regarded as a success, in view of the WATERLOO BRIIX (No. 6. ) The nex...t specimen here shown, the Menai Suspension Bridge, (No. S. ) indicates a great advance in the right direction. The use of chains or links and wire cables on the suspension principle began to be quite usual before this structure was com- menced by Telford in 1819. It is 570 feet span, and has a versed sine of forty-three feet for the curve of the Catenary. This form of bridge, however, was not at this time found suit- able for railways. The objection raised on account of vibra- tion has been obviated by the principle introduced in the next example, known as the Britannia Tubular Bridge, (No.
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