Giant first order Fresnel lighthouse lens.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...s_fullsize.jpg
Fullsize image: https://s3-us-west-1.amazonaws.com/h...n_fullsize.jpg
Previously:
Contact lens lathe - photo and videos
Lightbulb factory line - GIF
1938 lightbulb brightness testing machine - photo
Mortician contact lenses for keeping dead people's eyes closed - photo
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