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I climbed one when I was a small child, in th3e 1940s. They didn't actually flash.
Rather, they rotated, as coastal light houses still do today. A large 
spotlight was mounted at the top of a steel tower with a photocell
(or timer) that started the light and motor at twilight.
If there was any haze at all, you could see them over the horizon by the beam sweeping across the sky.
Hope this helps.
On Mon, 4 Oct 1999 15:09:45 -0400, Charles Wood wrote:
>Hello all,
>
>I subscribed to this list hoping to learn something about the
>flashing-beacon system used to guide aircraft along airways before the
>advent of electronic aids to navigation.
>
>I have exhausted all of the resources at my library, most of them just
>two-liners or so.
>
>Haven't had any meaningful success with search engines either.
>
>Can someone help me gather additional information on this system? It was
>in use from the early to mid 1920s up to about the late 1940s I think.
>
>Any help appreciated.
>
>Charlie
>
Rodney Myrvaagnes                   J36 Gjo/a
Associate Editor           Electronic Products
20+ years without a Car, a TV, or a website

   

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