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T. M. Tennant and Co of Bowershall Iron and Engine Works, Leith
1854-6 Listed as screw bolt and machine makers of 74 Clerk Street
1856-7 Listed as above and also as engineers as as of Newington Works, East Sciennes Street
1860-1 Listed with the additional address of St. Leonards
1862 Listed at the same and at Bowershall Iron Works
1866 Took limited status and gave their purpose as the manufacture of rolling stock and railway plant of all descriptions
c.1867 Made steam road vehicles for Robert William Thomson
1878 The company finally wound up. The site was later occupied by Bonnington Castings
'Messrs. Tennant and Co., of Leith, made a large number of road steamers for Mr. Thompson. Some of these, intended for passenger service, are already referred to; but they also made a considerable number of engines for heavy haulage purposes, one of which is illustrated in Mr. John Head's paper "On the Rise and Progress of Steam Locomotion on Common Roads," 1873.'