The Wilson solar grill uses latent heat storage to cook after sunset, collecting the heat with a Fresnel lens.
A Fresnel lens is a lens that works like a convex lens, but which eliminates the bulk of such a lens by the use of a series of angled steps in the front surface of an otherwise flat sheet of glass or plastic. The steps are angled in such a way as to concentrate light at the focus.
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See also
External links
- Designing a fresnel lens and mirror solar cooker - rimstar.org