Rees's_Cyclopaedia_-_Hooke's_optical_telegraph.png (592 × 558 pixels, file size: 63 KB, MIME type: image/png)
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current | 16:41, 2 February 2013 | 592 × 558 (63 KB) | Morgan Riley | {{Information |Description ={{en|1=Fig. 1 and 2 from the plate on "Telegraph" in Rees's ''Cyclopædia'', illustrating Robert Hooke's proposal for an optical telegraph system. For further explanatory text, see entry on "TELEGRAPH"... |
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