Telegraph System operated by water pressure.- South Africa.- Sam Sly's African Journal, 2 nos., printed newspapers, folds, browned, 400 x 285mm., Cape Town, 1848 & 1849. ⁂ With an article on a telegraph system operated by water.
Telegraph System operated by water pressure.- South Africa.- Sam Sly's African Journal, 2 nos., printed newspapers, folds, browned, 400 x 285mm., Cape Town, 1848 & 1849. ⁂ With an article on a telegraph system operated by water.
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