File:Optical telegraph.png
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Size of this preview: 800 × 499 pixels. Other resolution: 1,059 × 660 pixels.
Original file (1,059 × 660 pixels, file size: 840 KB, MIME type: image/png)
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 13:23, 20 May 2023 | | 1,059 × 660 (840 KB) | Ainin (talk | contribs) |
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