Date: Thu, 27 May 2004 16:21:42 -0400

Author: Gerald Zani

Subject: Re: prisms



The best high dispersion liquid for use in a liquid prism is carbon
disulfide I believe. Jerry

At 03:26 PM 5/27/2004 -0400, you wrote:
>If anyone can get a 'clean' glass walled 'water' prism (the ones on the
>austrian site appear to be lead soldered on the edges) then you can fill
>it with ethyl cinnamate (spelling)-- very high dispersion. Dick and Rae
>at VMI use this for their prism and it works lovely-- see O-270 in their
>demo manual for more on this. Don't open it often though, it supposedly
>has very strong smell.
>Does anyone know of a source for high quality glass prism 'jars'?? Dick n
>Rae had one with a glass stopper, so I think it's rather old.
>sampere wrote:
>>Those are water prisms. I have one of those and water just doesn't make
>>nice pretty rainbows. Keep the tips coming. We're going to stumble on
>>the right answer eventually.
>>I wish you could electropolish glass. Darn!
>>Machele Cable wrote:
>>>How about an Austrian Crystal "rainbow maker"? So far, I've caught that
>>>you really only want to make rainbows, right? This company has one that
>>>is 10 1/2 inches high for $36. They call it a Diamond, but it looks like
>>>a scewed cube to me. If its the right shape, you could have it cut and
>>>the one side reploished and get two out of it.
>>>At any rate, check it out. Scroll down to about the middle of the page.
>>>sampere wrote:
>>>>Chuck, Chuck, Chuck,
>>>>Thanks for trying to help. I already tried out the google search and
>>>>came up with nothing. I'm looking for an equilateral prism with sides
>>>>in the range of 3" ~ 4", or roughly 12" perimeter. The 35 mm (~1-1/2")
>>>>sides are very easy to find. I'm looking for a big honking prism.
>>>>I'm pretty sure that a bunch of you would want at least one if we can
>>>>find them for a reasonable price, right?
>>>>Arbor sells one, but it's acrylic. Anybody have any comments on that
>>>>one? I'm probably going to spent the $20 just to try it out.
>>>>Bill, how does n(lambda) of your cast prism compare to acrylic? Any idea?
>>>>I know I come across as pretty dense sometimes, but I'm really not that
>>>>dense. (Ok, no side comments from the peanut gallery here!) My 10 year
>>>>old was quite successful in teaching me how to use google efficiently.
>>>>Thanks y'all,
>Dr. William McNairy, Lecturer Phone: (919) 660-2689
>Lecture Demonstration Coordinator FAX: (919) 660-2525
>Department of Physics, Duke Univ. e-mail
>Box 90305
>Durham, NC 27708-0305

Gerald Zani e-mail:
Manager of Demonstrations phone: (401) 863-3964
Department of Physics FAX: (401) 863-2024
Brown University Providence, RI 02912-1843 USA

Do a little more of that work which you have confessed to be good,
Which you feel that society and your most Just Judge rightly demand of you.
Cultivate the tree which you have found to bear fruit in your soil.
If you have any experiments you would like to try, try them.
Now's your chance.

Henry David Thoreau, Journal entry, 1850.

From Thu May 27 16:45:28 2004