This one is a classic, along with one drop of perfume in a large apartment,
etc. I would guess it comes from calculations of the light emitted by a candle,
and the use of the inverse square law.
don
Donald McBurney
I don't have time to track down the origin.
Goss, Bill wrote:
> In the intro text I am using (Weiten) there is a statement that the absolute
> threshold for human vision is " a candle flame seen at 30 miles on a dark,
> clear night." Can someone tell me how this was determined? Did someone
> really do a field study on this?
> Thanks
>
> ---------------------------------------------------
> Bill Goss phone:(250) 489-2751, ext. 324
> College of the Rockies [EMAIL PROTECTED]
> Box 8500
> Cranbrook, BC, Canada
> V1C 5L7
>
