File:Single needle telegraph (Rankin Kennedy, Electrical Installations, Vol V, 1903).jpg
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 20:23, 18 December 2023 | | 798 × 923 (123 KB) | Isidore (talk | contribs) | == {{int:filedesc}} == Single-needle telegraph instrument. The markings on the dial are Morse code, but not in the conventional "dots" and "dashes" notation. This is the stroke notation used for Cooke and Wheatstone telegraph codes which is more appropriate for needle instruments. {{Scans from 'Rankin Kennedy, Electrical Installations', 1903 |volume=V |page= |figure= |title= |description= }} [[Category:... |
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