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Last updated: 29 September 2014
The Crossed Mirrors Cooker has been designed by John Futney, a physicist with a specialty in optical design. His intent was to design a solar cooker that would challenge the efficiency of most parabolic solar cookers but be simpler to manufacture and offer other user advantages. The simplicity is achieved by using single-curved reflective surfaces to focus heat down on to the top of a cook pot.
Light is first gathered by the lower mirrors, then reflected to the upper mirror, which then concentrates the light down onto the cook pot.
The cook pot is located near or on ground level. There is little chance of the cook looking into the concentrated sunlight and thus incurring eye injury. If the cook wants to reduce the heat (from a boil to a simmer), she or he only needs to toss a piece of cloth onto the lower mirrors, covering them enough as needed. For fried foods the griddle is heated first, then the food is added, allowing cooking to happen from above and below.
Read more about the design: Crossed Mirrors Solar Cooker
- See John Futhey.