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Summary
| Description |
English: A bi-form (i.e. duplicated) first-order Fresnel-lens optic, manufactured by Chance Brothers of Smethwick in 1914. Floating in a bath of mercury, it revolved around the lamps to produce a red flash once every five seconds. |
| Date | |
| Source | Own work |
| Author | Barabbas1312 |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:04, 5 November 2022 | | 3,024 × 4,032 (3.03 MB) | Barabbas1312 | Uploaded own work with UploadWizard |
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