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Old 06-01-2021, 02:14 PM   #1 (permalink)
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The Curly Cooker



https://www.sciencenews.org/archive/curly-cooker

This article is paywalled, but I've had a photocopy of this magazine cover since the 1980s that just srted to the top of a stack.. The article is paywalled, but everything you need to know is in the cover illustration.

Invented by a high-school student but it never went anywhere (that I'm aware of). So, if you grasp the inner an outer ends of the spiral and twist the spiral springs into a 3D shape. It acts as a 'Fresnel lens'.

At shallow angles it concentrates at a center above the spiral. At steeper angles it focuses behind the spiral.

In a post-apocalyptic scenario this could be valuable information.

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Old 06-02-2021, 10:27 AM   #2 (permalink)
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Old 06-02-2021, 02:00 PM   #3 (permalink)
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Quote:
but everything you I need to know remember is in the cover illustration.
I shouldn't speak for others.

Any reflective sheet material. I've been thinking about buying into a local maker-space to get access to a laser cutter. An interesting experiment would be to spring it to a preferred angle and then see if increasing or decreasing the outer radius is called for.
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Old 06-02-2021, 03:26 PM   #4 (permalink)
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So perhaps polished high nickel stainless of a largish diameter of perhaps 1/4".

That could be tough to extend and retract
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Old 06-02-2021, 04:52 PM   #5 (permalink)
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...a largish diameter of perhaps 1/4" [thickness]?

As an exemplar, yes. Mylar or aluminum foil would be reflective, it all comes down IMHO to the supporting structure. Maybe 3mm stainless steel? Buffed Polymetal?

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