# @stauglighthouse on Instagram

- **Type:** Image
- **Original URL:** https://www.instagram.com/p/DVE7GcCiqJY
- **Gondola URL:** https://gondola.cc/posts/57234378-stauglighthouse-instagram
- **Thumbnail:** https://img.gondola.cc/tr:w-,h-,fo-auto/postThumbnails/b106b45743.jpg
- **Posted:** 2026-02-22T22:28:42.000+00:00
- **Account Owner:** St. Augustine Lighthouse & MM (@stauglighthouse) — https://gondola.cc/stauglighthouse

## Caption

The St. Augustine Lighthouse, built from 1871-1874, received a first order Fresnel lens from Parisian lens maker Sautter, Lemonnier & Cie. 

The lens has 370 individual prisms and weighs roughly 2 tons. A 1000-watt light bulb currently serves as it light source, as it has since the tower was electrified in 1936.

The lens built for our lighthouse has three “bulls-eye” panels that send out beams of light. When the lens rotates, the rotating beams create the illusion of flashes to observers, a unique timing characteristic that differentiates our lighthouse from others and makes it identifiable at night. 

When first installed in 1874, a clockwork mechanism rotated the lens once every nine minutes, displaying a flash every three minutes. 

Today, with an electric motor, these flashes appear every 30 seconds.

📸: jwilson_aerial_photography 

#staugustinelighthouse #lens #fresnellens #light #staugustine

## Stats

- **Views:** 0
- **Likes:** 242
- **Shares:** 0
- **Comments:** 7

## Tags

fresnellens, staugustinelighthouse, lens, staugustine, light

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