Billy Goldfeder
Member
Many of the older "behive" style flashing/blinking warning lights used on fire apparatus featured "Fresnel" style lens to make the flashing light much more effective and visible. Thought you would enjoy this article about the history related to that style "amplifying" lens:
Fresnel Lens – The Invention That Saved a Million Ships | Fire Island News
The Fresnel lens was the “soul of the lighthouse,” a 16-foot high, pineapple-shaped lens that focused the light rays from the lantern room atop the tower, through heavy glass panels called storm panes, out to sea.Often called "the invention that saved a million ships," this marvel of a lens is...
fireisland-news.com