Date: Wed, 27 Oct 2004 17:35:33 -0400

Author: "Dick Heckathorn"

Subject: RE: additive color mixing demo

Post:

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Greetings,

Go to
http://www.cvcaroyals.org/~rheckathorn/documents/ColorSlidesforOverhead2
x4inch.doc for a Word file on how I create the overlapping colors using
a1 35 mm slide, color gels and three small mirrors.

Also go to http://www.cvcaroyals.org/~rheckathorn/OPColorandVision.htm
for items on color.

These are from my website listed below.

Enjoy, Dick


Helping teachers who facilitate, motivating students who learn.
Dick Heckathorn 14665 Pawnee Trail Middleburg Hts, OH 44130
440-826-0834
Physics Teacher CVCA 4687 Wyoga Lake Rd Cuyahoga Falls, OH 44224
330-929-0575 VM 120
www.cvcaroyals.org/~rheckathorn

-----Original Message-----
From: owner-tap-l@listproc.appstate.edu
[mailto:owner-tap-l@listproc.appstate.edu] On Behalf Of sampere
Sent: Wednesday, October 27, 2004 2:12 PM
To: tap-l@listproc.appstate.edu
Subject: Re: additive color mixing demo

I use RGB and MCY theatrical gels and three overhead projectors. Ok, so
blue isn't so white is actually a pinkish gray, but R+G makes a great
yellow which totally surprises most students.

How does one know that blue isn't so good? Shine a slit of blue on the
screen and hold a large holographic grating at the exit of the focusing
lens. You'll see blue and dim red and dim green. Try it with the rest
of the colors and see what you get.

Get the holographic grating from Project Star. Just buy a roll of the
stuff.

Sam

John Welch wrote:


Does anyone have a favorite lecture-size additive color mixing demo? We
got a set of those RGB chemical light sticks that you spin around, but
they don't add to a very convincing white. In the lab, I use a set of
Hodson light boxes with filters and vary their intensity individually,
and that works great, but it's a little small for a lecture demo.

-John

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