Date: Thu, 28 Oct 2004 21:41:44 -0400
Author: "Dick Heckathorn"
Subject: RE: additive color mixing demo
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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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10.0pt;font-family:Arial;color:navy'>Greetings,
/p>
10.0pt;font-family:Arial;color:navy'>
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.
10.0pt;font-family:Arial;color:navy'>
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
face=3DArial>
style=3D'font-size:10.0pt;font-family:Arial;color:navy'>San
Francisco
face=3DArial>
style=3D'font-size:10.0pt;font-family:Arial;color:navy'> at a
PTRA session.
10.0pt;font-family:Arial;color:navy'>
10.0pt;font-family:Arial;color:navy'>Dick
10.0pt;font-family:Arial;color:navy'>
10.0pt;font-family:Arial;mso-no-proof:yes'>
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.
color:navy;mso-no-proof:yes'>Dick =
Heckathorn
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'> =
Wyoga Lake Rd
color=3Dnavy>
style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'>Cuyahoga
Falls
8.0pt;color:navy;mso-no-proof:yes'>,
color=3Dnavy>
style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'>OH
t1:State>
VM 120
color=3Dnavy face=3D"Times New Roman">
style=3D'font-size:8.0pt;color:navy;
mso-no-proof:yes'>www.cvcaroyals.org/~rheckathorn
10.0pt;font-family:Arial;color:navy'>
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: =
style=3D'font-size:10.0pt;font-family:Tahoma;color:windowtext'>Thursday, =
October
28, 2004
PM
color:windowtext'>
To: =
tap-l@listproc.appstate.edu
Subject: Re: additive =
color mixing
demo
face=3D"Times New Roman">
style=3D'font-size:12.0pt'>
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!
face=3D"Times New Roman">
style=3D'font-size:12.0pt;color:windowtext'>
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.
face=3D"Times New Roman">
style=3D'font-size:12.0pt;color:windowtext'>
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>
face=3D"Times New Roman">
style=3D'font-size:12.0pt;color:windowtext'>
face=3DArial>
style=3D'font-size:10.0pt;font-family:Arial;color:windowtext'>-John
>
1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'=
>
face=3DArial>
style=3D'font-size:10.0pt;font-family:Arial;color:windowtext'>-----
Original Message -----
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 =
face=3DArial>
style=3D'font-size:10.0pt;font-family:Arial;color:windowtext;
font-weight:bold'>To:
face=3DArial>
title=3D"tap-l@listproc.appstate.edu">tap-l@listproc.appstate.edu
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'>Wednesday, =
October
27, 2004
PM
color:windowtext'>
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
face=3D"Times New Roman">
style=3D'font-size:12.0pt;color:windowtext'>
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.
://www.cvcaroyals.org/~rheckathorn/OPColorandVision.htm
color.
my website
listed below.
Dick
face=3DArial>
style=3D'font-size:10.0pt;font-family:Arial;mso-no-proof:yes'>
bold;mso-bidi-font-weight:normal;mso-no-proof:yes'>Helping teachers who
facilitate, motivating students who =
learn.
color:navy;mso-no-proof:yes'>Dick Heckathorn
style=3D'mso-spacerun:yes'>
14665 Pawnee Trail =
Middleburg
color:navy;mso-no-proof:yes'>Physics Teacher CVCA
Wyoga Lake Rd
color=3Dnavy>
style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'>Cuyahoga
Falls
8.0pt;color:navy;mso-no-proof:yes'>,
color=3Dnavy>
style=3D'font-size:8.0pt;color:navy;mso-no-proof:yes'>OH
t1:State>
VM 120
color:navy;mso-no-proof:yes'>www.cvcaroyals.org/~rheckathorn
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]
Sent: =
style=3D'font-size:10.0pt;font-family:Tahoma;color:windowtext'>Wednesday,=
October 27, 2004
PM
color:windowtext'>
To: =
tap-l@listproc.appstate.edu
Subject: Re: additive =
color mixing
demo
face=3D"Times New Roman">
style=3D'font-size:12.0pt'>
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'>
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.
face=3D"Times New Roman">
style=3D'font-size:12.0pt'>
face=3DArial>
style=3D'font-size:10.0pt;font-family:Arial'>-John
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From wreitz@neo.rr.com Thu Oct 28 18:31:38 2004