File:Fresnel lens, entrance (36255069764).jpg
Jump to navigation
Jump to search
Size of this preview: 684 × 599 pixels. Other resolutions: 274 × 240 pixels | 548 × 480 pixels | 876 × 768 pixels | 1,168 × 1,024 pixels | 2,337 × 2,048 pixels | 3,342 × 2,929 pixels.
Original file (3,342 × 2,929 pixels, file size: 3.27 MB, MIME type: image/jpeg)
Captions
Captions
Add a one-line explanation of what this file represents
Summary[edit]
.jpg&action=edit§ion=1){kind=link}
| Description |
Museum, Whitefish Point Fresnel lens A fourth order Fresnel lens, the second light used at Whitefish Point Lighthouse. The original structure was outfitted with Lewis lamps. A Fresnel lens can capture more oblique light from a light source, thus allowing the light from a lighthouse equipped with one to be visible over greater distances. In 1968, the light was replaced with a DCB-224 aero beacon, visible for a distance of 26 nautical miles, 30 miles. The DCB-224 Series Carlisle & Finch aerobeacon lens was changed to a light-emitting diode (LED) lantern with a reduced range of 15 nautical miles, 17 miles as permitted by Coast Guard. The aerobeacon lens is stored in a building on the Great Lakes Shipwreck Museum complex for possible future public display. (Wikipedia) |
| Date | |
| Source | Fresnel lens, entrance |
| Author | Deb Nystrom from Ann Arbor, Michigan, USA |
Licensing[edit]
.jpg&action=edit§ion=2){kind=link}
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
|
This image was originally posted to Flickr by Tatiana12 at https://flickr.com/photos/98826299@N00/36255069764. It was reviewed on 30 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 02:45, 30 November 2020 | | 3,342 × 2,929 (3.27 MB) | JotaCartas (talk | contribs) | Transferred from Flickr via #flickr2commons |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
.jpg&oldid=647014141){kind=link}