15K views · 264 reactions | A GIANT Fresnel Lens EXPERIMENT | The Backyard Scientist | Facebook

35 reactions · 23 shares | Fresnel lens @ Chesapeake Bay Maritime Museum Most Fresnel lenses look like a beehive or barrel; most contain from two to twenty-four different panels. A clock type mechanism, which had to be wound by hand every few hours before automation, was used to make the revolving lenses rotate around the lamp itself to produce the flash. The movement of the lens is timed precisely so the panel will pass by when a flash is due. | Mark Ward | Facebook