Description of the iron bridges of suspension now erecting over the strait of Menai, at Bangor, and over the river Conway, in North Wales : with two views: also some account of the different bridges of suspension in England and Scotland; particularly of Captain S. Brown's iron bar bridge over the river Tweed. With remarks on the proposed suspension bridge over the river Mercy, at Runcorn Gap; and some calculations of the strength of malleable iron, founded on experiments

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  Description of the iron bridges of suspension erected over the strait of Menai, at Bangor : over the river Conway, in North Wales; and over the river Thames, at Hammersmith; with views: also some account of the different bridges of suspension in England and Scotland ; with calculations of the strength of malleable iron, founded on experiments

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  Rudimentary treatise. Tubular and other iron girder bridges, particularly describing the Britannia and Conway bridges; : with a sketch of iron bridges, and illustrations of the application of malleable iron to the art of bridge-building

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  Visual Materials

  This collection contains 372 stereographic photographs (including some variants and duplicates) by photographer A. A. Hart that document the construction of the western half of first transcontinental railroad by the Central Pacific Railroad between 1864 and 1869. The collection includes all but seven of the original series, numbered from 1 to 364 by Hart (lacking 193, 323, 333, 358, 359, 362, and 364). The images chronicle the advancement of the railroad over 742 miles in California and the Sierra Nevada Mountains, Nevada, and Utah. The majority of the photographs are views of mountains, lakes, rivers, and forested areas (some with stumps from clear-cutting in the foreground), often with railroad tracks running through the center of the images. In addition, there are also images of locomotives, Chinese and other workers, equipment, bridges, tunnels, frontier and mining towns, construction camps, as well as some images of Native Americans, including Paiute and Shoshone Indians. The stereographs primarily contain Hart's own Sacramento imprint with series titles including: "Scenes in the Sierra Nevada Mountains"; "Scenes in the Valley of the Sacramento"; "Scenes in the Washoe Range"; "Scenes on the Humboldt River"; and "Scenes near Great Salt Lake". Interspersed in the collection are stereographs published without credit to Hart by Frank Durgan and Carleton E. Watkins.

  photCL 184