This is pretty special. We knew we had a lens coming in '07, but who would have thought we would get a FIRST FRESNEL!!!!!!!!!!!!!!!!!!!!!!
Here's some facts I've collected about the actual lens at St. Augie:
1) The lens is constantly white, when lit, with a bright flash every 30 * seconds.
2) Before electricity, the keepers had to wind the clockworks system that kept the lens turning. Weights were suspended from the rotating mechanism at the top, through the center of the tower. They hung just above the weight well in the bottom of the tower. In the lens room the keepers cranked this weight up to the first landing. Once wound, it would run close to 3 hours. This equipment is no longer in the tower.
3) The lens in the lighthouse ís the original first order Fresnel lens dating to 1874. It stands 9.5 feet tall and contains 370 hand-cut prisms, including three bulls-eyes, set in brass frames.
4) Today a 90-second lens rotation, with the three evenly spaced bulls-eyes, results in a night signature of one fixed light, white flash every 30 seconds. The beam can be seen a maximum of about 20 nautical miles, or 21.5 statute miles out to sea.
I'm guessing that this latest gem lights up and flashes, but the HL flyer doesn't say. Curious and hoping it does.
Merry Christmas, Harbour Lights, and THANK YOU!
Judy
(definitely a Fresnel fan!)
* FLASH Pattern: Today a 90-second lens rotation, with the three evenly spaced bulls-eyes, results in a night signature of one fixed light, white flash every 30 seconds. From:
St. Augustine Lighthouse & Museum