Date: Thu, 28 Oct 2004 21:41:44 -0400

Author: "Dick Heckathorn"

Subject: RE: additive color mixing demo

Post:

This is a multi-part message in MIME format.

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Greetings,

If the red light is a little too bright, try putting two layers of red
filters, or three or. It worked for me.

By the way, I think the three mirror idea was written up in The Physics
Teacher. I can't remember who first showed it to me but it was at an
AAPT meeting in San Francisco at a PTRA session.

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 John Welch
Sent: Thursday, October 28, 2004 2:23 PM
To: tap-l@listproc.appstate.edu
Subject: Re: additive color mixing demo

I tried out the slide projector + 3 mirrors idea - it works great! The
filters I have give a pretty good white, but I helped them out a little
bit by putting my most scratched mirror with the red light, which was a
little too bright - a great neutral density filter!

I am still interested in the LCD projector idea, but I think if I get
one, I'm going to cut the holes so that they give 3 separate circles and
then use mirrors, because I like to be able to move the spots in and
out: I think it makes the demo more dynamic and less black boxy.

Thanks for the great ideas everyone - Tap-L is great!!

-John
----- Original Message -----
From: Dick Heckathorn
To: tap-l@listproc.appstate.edu
Sent: Wednesday, October 27, 2004 2:35 PM
Subject: RE: additive color mixing demo

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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style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Greetings,
<=
/p>

style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> 



style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>If the red light is a little too =
bright,
try putting two layers of red filters, or three or… It worked for =
me.



style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> 



style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>By the way, I think the three =
mirror idea
was written up in style=3D'mso-spacerun:yes'>  The
Physics Teacher. I can’t remember who first showed it to me but it =
was at
an AAPT meeting in
color=3Dnavy
face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:navy'>San
Francisco
color=3Dnavy
face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:navy'> at a
PTRA session.



style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> 



style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Dick



style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> 





style=3D'font-size:
10.0pt;font-family:Arial;mso-no-proof:yes'> 
>



style=3D'mso-bidi-font-weight:
normal'> style=3D'font-size:
7.5pt;color:navy;font-weight:bold;mso-bidi-font-weight:normal;mso-no-proo=
f:
yes'>Helping teachers who facilitate, motivating students who =
learn.



style=3D'text-align:center'> size=3D1 color=3Dnavy face=3D"Times New Roman"> style=3D'font-size:7.5pt;
color:navy;mso-no-proof:yes'>Dick =
Heckathorn
size=3D1 color=3Dnavy> style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'> style=3D'mso-spacerun:yes'>  14665 Pawnee Trail style=3D'mso-spacerun:yes'>  Middleburg =
size=3D1 color=3Dnavy> style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'>Hts st1:City> size=3D1 color=3Dnavy> style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'>, =
size=3D1 color=3Dnavy> style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'>OH t1:State> size=3D1 color=3Dnavy> style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'> style=3D'mso-spacerun:yes'>  =
color=3Dnavy> style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'>44130=
size=3D1 color=3Dnavy> style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'> style=3D'mso-spacerun:yes'>  =
440-826-0834



size=3D1
color=3Dnavy face=3D"Times New Roman"> style=3D'font-size:8.0pt;color:navy;
mso-no-proof:yes'>Physics Teacher CVCA style=3D'mso-spacerun:yes'>  =
size=3D1 color=3Dnavy> style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'>4687
Wyoga Lake Rd
color=3Dnavy> style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'> style=3D'mso-spacerun:yes'>  size=3D1
color=3Dnavy> style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'>Cuyahoga
Falls
style=3D'font-size:
8.0pt;color:navy;mso-no-proof:yes'>,
size=3D1
color=3Dnavy> style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'>OH
t1:State> size=3D1 color=3Dnavy> style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'> =
size=3D1 color=3Dnavy> style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'>44224=
size=3D1 color=3Dnavy> style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'> style=3D'mso-spacerun:yes'>  330-929-0575 style=3D'mso-spacerun:yes'> 
VM 120



size=3D1
color=3Dnavy face=3D"Times New Roman"> style=3D'font-size:8.0pt;color:navy;
mso-no-proof:yes'>www.cvcaroyals.org/~rheckathorn
>





style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> 



color=3Dblack
face=3DTahoma> style=3D'font-size:10.0pt;font-family:Tahoma;color:windowtext'>-----Origi=
nal
Message-----

From: =
owner-tap-l@listproc.appstate.edu
[mailto:owner-tap-l@listproc.appstate.edu] style=3D'font-weight:bold'>On
Behalf Of
John Welch

Sent: =
Month=3D"10" Day=3D"28" Year=3D"2004"> face=3DTahoma> =
style=3D'font-size:10.0pt;font-family:Tahoma;color:windowtext'>Thursday, =
October
28, 2004
face=3DTahoma> style=3D'font-size:10.0pt;font-family:Tahoma;color:windowtext'> =
Hour=3D"14" Minute=3D"23"> face=3DTahoma> style=3D'font-size:10.0pt;font-family:Tahoma;color:windowtext'>2:23 =
PM
size=3D2 color=3Dblack face=3DTahoma> style=3D'font-size:10.0pt;font-family:Tahoma;
color:windowtext'>

To: =
tap-l@listproc.appstate.edu

Subject: Re: additive =
color mixing
demo



color=3Dblack
face=3D"Times New Roman"> style=3D'font-size:12.0pt'> 





color=3Dblack
face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:windowtext'>I
tried out the slide projector + 3 mirrors idea - it works great! The =
filters I
have give a pretty good white, but I helped them out a little bit by =
putting my
most scratched mirror with the red light, which was a little too bright =
- a
great neutral density filter!
style=3D'color:windowtext'>







color=3Dblack
face=3D"Times New Roman"> style=3D'font-size:12.0pt;color:windowtext'>  t>







color=3Dblack
face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:windowtext'>I
am still interested in the LCD projector idea, but I think if I get one, =
I'm
going to cut the holes so that they give 3 separate circles and then use
mirrors, because I like to be able to move the spots in and out: I think =
it
makes the demo more dynamic and less black boxy.
color=3Dblack> style=3D'color:windowtext'>







color=3Dblack
face=3D"Times New Roman"> style=3D'font-size:12.0pt;color:windowtext'>  t>







color=3Dblack
face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:windowtext'>Thanks
for the great ideas everyone - Tap-L is great!!
color=3Dblack> style=3D'color:windowtext'>







color=3Dblack
face=3D"Times New Roman"> style=3D'font-size:12.0pt;color:windowtext'>  t>







color=3Dblack
face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:windowtext'>-John >
color=3Dblack> style=3D'color:windowtext'>





1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'=
>



color=3Dblack
face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:windowtext'>-----
Original Message -----







style=3D'margin-left:.5in;background:#E4E4E4'> color=3Dblack face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;
color:windowtext;font-weight:bold'>From:
color=3Dblack face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;
color:windowtext'> title=3D"dickheckathorn@sbcglobal.net">Dick Heckathorn =







color=3Dblack
face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:windowtext;
font-weight:bold'>To:
face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:windowtext'> href=3D"mailto:tap-l@listproc.appstate.edu" =
title=3D"tap-l@listproc.appstate.edu">tap-l@listproc.appstate.edu







color=3Dblack
face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:windowtext;
font-weight:bold'>Sent:
face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:windowtext'> =
Month=3D"10" Day=3D"27" Year=3D"2004"> face=3DArial> =
style=3D'font-size:10.0pt;font-family:Arial;color:windowtext'>Wednesday, =
October
27, 2004
face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:windowtext'> =
Hour=3D"14" Minute=3D"35"> face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:windowtext'>2:35 =
PM
size=3D2 color=3Dblack face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;
color:windowtext'>







color=3Dblack
face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:windowtext;
font-weight:bold'>Subject:
face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:windowtext'>
RE: additive color mixing demo







color=3Dblack
face=3D"Times New Roman"> style=3D'font-size:12.0pt;color:windowtext'>  t>





color=3Dnavy face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:navy'>Greetings, o:p>



color=3Dnavy face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:navy'> =



color=3Dnavy face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:navy'>Go to style=3D'mso-spacerun:yes'>  href=3D"http://www.cvcaroyals.org/~rheckathorn/documents/ColorSlidesforOv=
erhead2x4inch.doc">http://www.cvcaroyals.org/~rheckathorn/documents/Color=
SlidesforOverhead2x4inch.doc
for a Word file on how I create the overlapping colors using a1 35 mm =
slide,
color gels and three small mirrors.



color=3Dnavy face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:navy'> =



color=3Dnavy face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:navy'>Also go to style=3D'mso-spacerun:yes'>  href=3D"http://www.cvcaroyals.org/~rheckathorn/OPColorandVision.htm">http=
://www.cvcaroyals.org/~rheckathorn/OPColorandVision.htm style=3D'mso-spacerun:yes'>  for items on =
color.



color=3Dnavy face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:navy'> =



color=3Dnavy face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:navy'>These are from =
my website
listed below.



color=3Dnavy face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:navy'> =



color=3Dnavy face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:navy'>Enjoy, =
Dick



color=3Dnavy face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:navy'> =





color=3Dblack
face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;mso-no-proof:yes'> =



style=3D'margin-left:.5in;text-align:center'> style=3D'mso-bidi-font-weight:normal'> face=3D"Times New Roman"> style=3D'font-size:7.5pt;color:navy;font-weight:
bold;mso-bidi-font-weight:normal;mso-no-proof:yes'>Helping teachers who
facilitate, motivating students who =
learn.



style=3D'margin-left:.5in;text-align:center'> size=3D1 color=3Dnavy face=3D"Times New Roman"> style=3D'font-size:7.5pt;
color:navy;mso-no-proof:yes'>Dick Heckathorn style=3D'mso-spacerun:yes'> 
14665 Pawnee Trail  =
Middleburg
size=3D1 color=3Dnavy> style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'>Hts st1:City> size=3D1 color=3Dnavy> style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'>, =
size=3D1 color=3Dnavy> style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'>OH t1:State> size=3D1 color=3Dnavy> style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'> style=3D'mso-spacerun:yes'>  =
color=3Dnavy> style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'>44130=
size=3D1 color=3Dnavy> style=3D'font-size:7.5pt;color:navy;mso-no-proof:yes'> style=3D'mso-spacerun:yes'>  =
440-826-0834



style=3D'margin-left:.5in;text-align:center'> size=3D1 color=3Dnavy face=3D"Times New Roman"> style=3D'font-size:8.0pt;
color:navy;mso-no-proof:yes'>Physics Teacher CVCA style=3D'mso-spacerun:yes'>  =
size=3D1 color=3Dnavy> style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'>4687
Wyoga Lake Rd
color=3Dnavy> style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'> style=3D'mso-spacerun:yes'>  size=3D1
color=3Dnavy> style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'>Cuyahoga
Falls
style=3D'font-size:
8.0pt;color:navy;mso-no-proof:yes'>,
size=3D1
color=3Dnavy> style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'>OH
t1:State> size=3D1 color=3Dnavy> style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'> =
size=3D1 color=3Dnavy> style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'>44224=
size=3D1 color=3Dnavy> style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'> style=3D'mso-spacerun:yes'>  330-929-0575 style=3D'mso-spacerun:yes'> 
VM 120



style=3D'margin-left:.5in;text-align:center'> size=3D1 color=3Dnavy face=3D"Times New Roman"> style=3D'font-size:8.0pt;
color:navy;mso-no-proof:yes'>www.cvcaroyals.org/~rheckathorn span>





color=3Dnavy face=3DArial> style=3D'font-size:10.0pt;font-family:Arial;color:navy'> =



color=3Dblack
face=3DTahoma> style=3D'font-size:10.0pt;font-family:Tahoma;color:windowtext'>-----Origi=
nal
Message-----

From:
owner-tap-l@listproc.appstate.edu =
[mailto:owner-tap-l@listproc.appstate.edu] style=3D'font-weight:bold'>On Behalf Of
sampere

Sent: =
Month=3D"10" Day=3D"27" Year=3D"2004"> face=3DTahoma> =
style=3D'font-size:10.0pt;font-family:Tahoma;color:windowtext'>Wednesday,=

October 27, 2004
face=3DTahoma> style=3D'font-size:10.0pt;font-family:Tahoma;color:windowtext'> =
Hour=3D"14" Minute=3D"12"> face=3DTahoma> style=3D'font-size:10.0pt;font-family:Tahoma;color:windowtext'>2:12 =
PM
size=3D2 color=3Dblack face=3DTahoma> style=3D'font-size:10.0pt;font-family:Tahoma;
color:windowtext'>

To: =
tap-l@listproc.appstate.edu

Subject: Re: additive =
color mixing
demo



color=3Dblack
face=3D"Times New Roman"> style=3D'font-size:12.0pt'> 



color=3Dblack
face=3D"Times New Roman">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:


style=3D'mso-special-character:line-break'>





color=3Dblack
face=3DArial>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.







color=3Dblack
face=3D"Times New Roman"> style=3D'font-size:12.0pt'> 







color=3Dblack
face=3DArial> style=3D'font-size:10.0pt;font-family:Arial'>-John
p>













------=_NextPart_000_0032_01C4BD36.ECBB0660--

From wreitz@neo.rr.com Thu Oct 28 18:31:38 2004

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