You can still buy these things: 
http://www.exploratorium.edu/snacks/parabolas.html

Catseyeman

"Tom A." <met### [at] yahoocom> wrote in message 
news:4249e23b$1@news.povray.org...
> stm31415 wrote:
>
>> #3
>>
>>
>> ------------------------------------------------------------------------
>>
> So, is the upper "cover" a parabolic mirror, too?
>
> I remember seeing one of these at Brentano's books in the early 70's.
>
> Cool job.
>
> Tom A.

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