File:A first order Fresnel lens (8749610639).jpg
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| Description |
<Japanese> 一等レンズ（沖ノ島灯台で使用） このレンズは犬吠埼灯台のレンズと同等の大型一等レンズで、一等レンズの国産第一号として沖ノ島灯台（福岡県宗像市）において、大正11年（1922年）から平成19年（2007年）まで約100年間、使用されておりました。 レンズ本体の高さ 2.53m 、直径 3.03m 、レンズの重量 2.65 トン、装置全体の高さ 5.15m 、総重量 13 トンです。 回転装置と一体となった一等レンズの全容を見ることができるのは全国で当展示館のみです。 ──犬吠埼灯台の展示館内より、案内板から転載 </Japanese> |
| Date | |
| Source | A first order Fresnel lens |
| Author | hiroaki from Tokyo, Japan |
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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by hwat at https://flickr.com/photos/66433743@N00/8749610639. It was reviewed on 4 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 05:35, 4 November 2020 | | 1,024 × 681 (135 KB) | JotaCartas (talk | contribs) | Transferred from Flickr via #flickr2commons |
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