Date: Thu Sep 4, 2003 1:58:30 PM US/Central

Author: Paul Nord

Subject: Re: laser-blasted glass cubes

Post:

Message was rejected because it contained the text "Se*rch for".

Begin forwarded message:

> From: Paul Nord
> Date: Thu Sep 4, 2003 1:58:30 PM US/Central
> To: tap-l@listproc.appstate.edu
> Cc: Paul Nord
> Subject: Re: laser-blasted glass cubes
>
> Nope. That's where the beam was focussed.
>
> Google for femto-second lasers and other glass engravings.
>
> Paul
>
> On Thursday, September 4, 2003, at 11:37 AM, sampere wrote:
>
>> We went on a family vacation to Disney last year. One morning, they
>> took our picture and that evening, they delivered to our hotel, two
>> fairly large glass cubes with flat 'photos' of our kids and a 3-D
>> Mickey Mouse. Very cool.
>> Maybe I missed it already, but do we know whats happening inside? Is
>> each white dot a small region of glass that was melted by the
>> intersection of 2 or more laser beams?
>>
>> Sam
>>
>> Patricia Sievert wrote:
>>
>>> I found some for a dollar at one of the local "dollar stores" later
>>> this summer. It's only about 5 cm cubed, so too small for my demo
>>> show, but at that price, I had to get one.
>>> Pati
>>>
>>> Ryan, Samantha wrote:
>>>
>>>> That webpage is pricey! I saw similar at a gasstation in MT this
>>>> summer
>>>> for around $15-20. If I'd have been thinking about my students I
>>>> might have
>>>> picked one up at the time. Instead I was thinking about
>>>> MooseTracks Ice
>>>> Cream. =)
>>>>
>>>> SMR
>>>>
>>>> -----Original Message-----
>>>> From: William Beaty
>>>> To: tap-l@listproc.appstate.edu
>>>> Sent: 7/1/03 2:09 AM
>>>> Subject: laser-blasted glass cubes
>>>>
>>>>
>>>> Here's something weird. Using an infrared pulse-laser to "scribe"
>>>> little
>>>> white spots on the inside of a transparent block.
>>>>
>>>> http://www.npionline.com/products/thumbnails/tn003000.html
>>>> http://www.lasermaxmed.com.tw/3d-e.htm
>>>> http://65.108.81.194/products/pr003002.444.html
>>>>
>>>>
>>>> (((((((((((((((((( ( ( ( ( (O) ) ) ) )
>>>> )))))))))))))))))))
>>>> William J. Beaty SCIENCE HOBBYIST website
>>>> billb@eskimo.com http://amasci.com
>>>> EE/programmer/sci-exhibits amateur science, hobby projects, sci
>>>> fair
>>>> Seattle, WA 206-789-0775 unusual phenomena, tesla coils, weird
>>>> sci
>>>>
>>>>
>>>>
>>>
>>
>
From billb@eskimo.com Thu Sep 4 15:43:11 2003
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Date: Thu, 4 Sep 2003 12:45:45 -0700 (PDT)
From: William Beaty
To: tap-l@listproc.appstate.edu
Subject: Re: laser-blasted glass cubes
In-Reply-To: <3F576345.7010700@physics.niu.edu>
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On Thu, 4 Sep 2003, Patricia Sievert wrote:

> I found some for a dollar at one of the local "dollar stores" later this
> summer. It's only about 5 cm cubed, so too small for my demo show, but
> at that price, I had to get one.
> Pati


Does anyone have a YAG pulse laser which can put out many hundred watts
per pulse? I suspect that all you need is a lens and a hunk of glass
with one polished face, and if the laser's focus is within the glass, it
makes a small white dot when fired. Figure out how to move the block
around and you can plot 3D graphs, etc.

Hey, if you could make the dots small enough, you could draw the solar
system at the proper scale, with a visible sun and gas giants, and inner
planets which could only be seen if you took the cube out into bright
sunlight.







>
> Ryan, Samantha wrote:
>
> > That webpage is pricey! I saw similar at a gasstation in MT this summer
> >for around $15-20. If I'd have been thinking about my students I might have
> >picked one up at the time. Instead I was thinking about MooseTracks Ice
> >Cream. =)
> >
> >SMR
> >
> >-----Original Message-----
> >From: William Beaty
> >To: tap-l@listproc.appstate.edu
> >Sent: 7/1/03 2:09 AM
> >Subject: laser-blasted glass cubes
> >
> >
> >Here's something weird. Using an infrared pulse-laser to "scribe"
> >little
> >white spots on the inside of a transparent block.
> >
> >http://www.npionline.com/products/thumbnails/tn003000.html
> >http://www.lasermaxmed.com.tw/3d-e.htm
> >http://65.108.81.194/products/pr003002.444.html
> >
> >
> >(((((((((((((((((( ( ( ( ( (O) ) ) ) ) )))))))))))))))))))
> >William J. Beaty SCIENCE HOBBYIST website
> >billb@eskimo.com http://amasci.com
> >EE/programmer/sci-exhibits amateur science, hobby projects, sci fair
> >Seattle, WA 206-789-0775 unusual phenomena, tesla coils, weird sci
> >
> >
> >
> >
>
> --
> Patricia Sievert
> Physics Outreach Coordinator
> 219 Faraday Hall
> Physics Department
> Northern Illinois University
> DeKalb, IL 60115
> sievert@physics.niu.edu
> (815) 753-6418
>
>

(((((((((((((((((( ( ( ( ( (O) ) ) ) ) )))))))))))))))))))
William J. Beaty SCIENCE HOBBYIST website
billb@eskimo.com http://amasci.com
EE/programmer/sci-exhibits amateur science, hobby projects, sci fair
Seattle, WA 206-789-0775 unusual phenomena, tesla coils, weird sci
From Roger_Feeley@umit.maine.edu Thu Sep 4 16:38:33 2003
Message-id:
Date: Thu, 04 Sep 2003 16:38:15 -0400
Subject: Re: Cesium Source
To: tap-l@listproc.appstate.edu
From: "Roger Feeley"
References: <4562486.1062696504227.JavaMail.gpuskar@mix.wvu.edu>
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Can you give a physical description of it as well as any other information that would help determine what source it is?

Roger

Roger Feeley
roger.feeley@umit.maine.edu
From gpuskar@mix.wvu.edu Thu Sep 4 17:37:51 2003
Message-ID: <7734734.1062711607359.JavaMail.gpuskar@mix.wvu.edu>
Date: Thu, 4 Sep 2003 17:40:07 -0400 (EDT)
From: Gregory P Puskar
To: tap-l@listproc.appstate.edu
Subject: Re: Cesium Source
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In my frustration, I was thinking it was one of the shorter half-life
isotopes. At this point in time, we do not know anything about this
beam calibrator. We know it is a beam calibrator thanks to Steve W.
and Tim S. The Dean who is basically demanding this money probably
has not seen it either. Apparently it is stored in some remote place
on campus. I guess we will need to dig into this further with the
administration.

Paul, would you store it for $3K?

Thanks to all who replied.

Greg


Paul Nord wrote:


>The half-life of CS-137 is 30 years. Two questions: How old is it?
>What was the activity when it was new?
>
>For $6k I'd agree to keep it in the back of my garage.
>
>Paul
>



----------------------------------------
Gregory Puskar
Lab Manager/WVU Physics Dept.
Morgantown, WV 26506
Phone: 304-293-3422 x 1455
Fax: 304-293-5732
From stjohn@buphy.bu.edu Fri Sep 5 11:09:33 2003
Date: Fri, 5 Sep 2003 11:12:01 -0400
From: "Jason St. John"
To:
Subject: sulfur hexafluouride
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What purity do I need if someone wants to try inhaling SF6? "Instrument
Grade" is available from Airgas, and 99.9% pure. That's a real
measurement. They say they can't sell that grade for human consumption,
but their concerns seems to be about drug-testing forms rather than
toxicity. While I'm waiting for the rep to call back, I'd love some of
that good old fashioned tap-l discussion.

-jmsj
____________________________________________________
Jason St. John 617.353.2634 stjohn@bu.edu
Boston University Physics Lecture Demonstrations
590 Commonwealth Ave. Boston, MA 02215
From Ayars@mailaps.org Fri Sep 5 11:32:25 2003
Date: Fri, 5 Sep 2003 08:35:00 -0700
Subject: Re: sulfur hexafluouride
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