Re: Bears and Butterflies

[boblong@xxxxxxxxxxx (Robert Long)]

On Tue, 03 Dec 1996 09:11:58 +0000 (GMT), Willem-Jan Markerink wrote:

|The ectoplasm you saw was probably multi color, right?

The image I saw was b&w.  That's not to say, however, that it may not
have been a b&w copy made from a color original.  I can't even
remember whether I saw it in a magazine or in a press handout.  If the
latter, it was sufficiently long ago that it was likely to have been
an 8x10 glossy, since color prints and slides were seldom included
with the handouts until recently.  (Standard practice was to put a
note at the bottom of the press release: "Transparencies
available...")

|I found the (Ralleigh) scattering theory quite nice; it basically=20
|says that you can see red from a longer distance than blue.

As I said earlier (here, or in e-mail?), I have a problem with this
because of the distances involved.  When you go to above 30,000 feet
in a plane, you can no longer see blue in the landscape beneath you.
But that's six miles (what--eight km?) up.  At only a few thousand
feet, colors look relatively normal.  The blue is invisible in these
bulbs at about 100 yards/meters.

|I have a list of the various scattering phenomena on my homepage,
|extracted from a discussion on the newsgroup sci.optics (highly

Yes:  Interesting, but I'm not convinced it's applicable.

Bob Long
(boblong@xxxxxxxxxxx)

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Topic No. 9