At 16:03 13-5-99 -0400, you wrote: -----Original Message/Oorspronkelijk bericht-------------- >>Mac Oglesby wrote: >> >>> .... a dial to indicate >>> relative sunburn danger. Installed at a swimming pool or beach, this type >>> of dial wouldn't even need any hour lines - regions of color would alert >>> the sunbather as to when (s)he would burn most rapidly. > > >Ross McCluney replied: > >>As an optical/solar physicist, I was intrigued by this, and the possible >>errors >>in its use. As long as the sunbather is in a horizontal position, and not >>particularly concerned about sunburn on the sides, just on the top, one could >>have a vertical post gnomon with concentric circular rings around it, giving >>zones of angle of incidence upon a horizontal plane. With the sun highest in > >(snip) > > >Hi Ross, > >Thanks for your thoughtful response. Most of what you wrote hadn't >occurred to me - but then I never seriously considered making such a dial >myself. I guess that if a "sunburn" dial were installed in any public >place, extensive disclaimers would need to accompany it. Imagine that - a >"dangerous" sundial! > >Mac > This kind of disclaimers are only found in the USA and on products from the USA ;-)
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