The cosmopolitan underground telegraph,
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Article
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1885
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Elsevier Science
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English
β 38 KB
A. b." of the Seetio~'s Classification.) This conduit is constructed of highly glazed terra cotta, in sections two feet in length, with a tap joint on tile top and ends, and is bedded on a cast iron or terra eotta base plate. Its interior is fitted with iron frames, placed at suitable distances ap