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Old form single needle telegraph instrument used by the Glasgow and South Western Railway Company from 1855 to 1870, when the telegraphs were taken over by the state
Single needle telegraph instrument in glazed mahogany case, W.T. Henley, late 19th century
Single needle telegraph instrument made and used by Alexander Bain of Edinburgh, said to be the first such instrument made by Bain and is possibly the first single needle instrument ever constructed