Another recent addition to the family of Parabolic cooker comes from the prolific inventor Mr Deris of California. The Parabola it self is simple, he seems to have discarded the interesting design of square Parabola invented by himself. The parabola he uses is held vertically, and it directs the focused rays on to a Cooking vessel kept on a reflector kept horizontally on the ground.
Interestingly way back in 1980, I had proposed that a reflector/focusing device kept outside or in a suitable position would point focus the image in the house which could then be used for cooking. This design you would see under Type ---but such a concept has already taken shape, independently at Bahai institute in India and with the help of a parabolic reflector kept out side the hut cooking even Chapathis are being cooked.
Fig 3a1 & 2 Photos from Bahai Institute, India ( Ref. their site on the web )
The following diagram shows the principle of Scheffler's reflective cooker design in detail.
The photos bellow shows Scheffler's reflective cooker, a 2.7 m dia cooker, just out side an Indian Home, The photos are from ecosolar.com. The second photo shows a lady cooking in a small kitchen.
The parabolic cookers are being uses in Africa as well and the photo below confirms it further.
Attempt are on worldwide to form parabolas from other materials. In India it is being made from mud. The photo included, taken form Solarcooking.org site, confirms this.
Many interesting variations have been reported, and some of the following photos, taken from Solar cooking.org, are self explanatory.
Note the light but stable stand arrangement, looks like it could be easily tucked in a corner and easily transported as well. ( Ref. solracooking.org site )
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