Date: Wed, 10 Sep 2003 13:03:41 -0400

Author: Gerald Zani

Subject: Re: Silica Sand Safety

Post:

"Coconut charcoal" is exactly that, it is burned coconuts. Looks like
black powder. Charcoal powder. Jerry

At 08:37 AM 9/10/2003 -0700, you wrote:
>Please forgive me, Jerry, but what's "coconut charcoal"? I've never
>heard of this stuff......
>
>- Rk
>
>At 01:18 PM 9/9/2003 -0400, you wrote:
>>i use washed sea sand from VWR. i lightly sprinkle the top layer with
>>chocolate powder or coconut charcoal. jerry
>
>[snip]
>
>
> =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
> Roger Key rogerk@csufresno.edu
>California State University, Fresno phone 559-278-2728
> Department of Physics MH#37 paper fax 559-278-7741
> 2345 E San Ramon Ave
> Fresno CA 93740-8031
>
>"To have peace with this peculiar life; to accept what
>we do not understand; to wait calmly for what awaits us,
>you have to be wiser than I am." - MC Escher
>
>Physics Department Web Page: http://physics.csufresno.edu
>Downing Planetarium Web Page: http://www.Downing-Planetarium.org
>Physics Instructional Resource Association: http://www.pira.nu

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

URL http://www.physics.brown.edu/users/staff/zani/index.html
URL http://www.physics.brown.edu/Studies/Demo/

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 KBouff@aol.com Wed Sep 10 22:06:41 2003
From: KBouff@aol.com
Message-ID: <2b.476463ad.2c91334f@aol.com>
Date: Wed, 10 Sep 2003 22:09:19 EDT
Subject: Re: Medically oriented demos
To: tap-l@listproc.appstate.edu
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While this doesn't refer to instruments, I have had my students disect cow's
eyes and the lenses . We can then talk about lenses used to correct vision and
the new laser surgery for nearsightedness.
Karen Bouffard
From rgpiccioni@msn.com Thu Sep 11 09:14:12 2003
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From: "RICHARD PICCIONI"
To:
References: <8DB9C75E-E201-11D7-B96B-000393B080FA@valpo.edu>
Subject: Re: Connecting computer to projector
Date: Thu, 11 Sep 2003 06:14:03 -0700
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Thanks much to all for the great advice. I've ordered a $45 splitter =
booster and a 15' VGA cable. Guess I'll keep my fingers crossed. And, =
yes, the image was OK with a 6-ft cable at 800X600. Oops! Off to class =
...
Richard Piccioni
Garfield High School
Seattle
----- Original Message -----=20
From: Paul Nord=20
To: tap-l@listproc.appstate.edu=20
Cc: Paul Nord=20
Sent: Monday, September 08, 2003 6:37 AM
Subject: Re: Connecting computer to projector


I'll second the notion of quality VGA cables.

I'm curious to know if the image looks good with a 6 foot cable. I'd=20
guess that your projectors are just VGA resolution (800X600) and =
you're=20
trying to drive them at XGA or resolution (1024X768). They'll try to=20
show an image, but it will look horrible.

Paul

On Sunday, September 7, 2003, at 08:42 AM, Gary Steinberg wrote:

> Richard,
>
> The higher quality VGA cables should be able to reach 25ft without
> significant signal loss--usually by splitting the RGB signals and =
the
> accompanying horizontal and vertical syncs into separate coax cables =

> and
> then back. They cost in the neighborhood of $50 to $100 and should =
not
> need a booster (we run a 50ft cable without a booster with no =
visible
> image loss). Do not use RCA or S-video connections; they will =
usually
> limit the resolution to NTSC standards (approx. 720 x 480) and will=20
> always
> diminish the color resolution. If you have component outputs on =
your=20
> card
> and inputs on your projector you could run coax connectors for these =

> as an
> alternative.
>
> Gary Steinberg
>
> On Sat, 6 Sep 2003, RICHARD PICCIONI wrote:
>
>> What's the best way to connect our demo-table PC to a multimedia=20
>> projector so the two can be separated by a distance of about 12-15 =
>> ft?
>>
>> Some specifics:
>> PC running Windows 2k; Panasonic PTL-557U or Mitsubishi SL-1=20
>> projector.
>> We tried an ATI Radeon 7000 video card and an RCA wire, but image=20
>> quality was truly lousy at every setting we could find.
>>
>> Thanks,
>> Richard Piccioni
>> Garfield High School
>> Seattle WA
>> rgpiccioni@seattleschools.org
>


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name=3D"Compose message area"> />


Thanks much to all for the great advice. I've ordered a $45 =
splitter=20
booster and a 15' VGA cable.  Guess I'll keep my fingers =
crossed. =20
And, yes, the image was OK with a 6-ft cable at 800X600.  Oops! Off =
to=20
class ...

Richard Piccioni

Garfield High School

Seattle

style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
----- Original Message -----

From: href=3D"mailto:Paul.Nord@valpo.edu">Paul Nord

To: =
href=3D"mailto:tap-l@listproc.appstate.edu">tap-l@listproc.appstate.edu A>=20

Cc: href=3D"mailto:Paul.Nord@valpo.edu">Paul Nord

Sent: Monday, September 08, =
2003 6:37=20
AM

Subject: Re: Connecting =
computer to=20
projector


I'll second the notion of quality VGA =
cables.

I'm=20
curious to know if the image looks good with a 6 foot cable.  I'd =


guess that your projectors are just VGA resolution (800X600) and =
you're=20

trying to drive them at XGA or resolution (1024X768).  =
They'll try to=20

show an image, but it will look horrible.

Paul

On =
Sunday,=20
September 7, 2003, at 08:42  AM, Gary Steinberg =
wrote:

>=20
Richard,
>
> The higher quality VGA cables should be able =
to reach=20
25ft without
> significant signal loss--usually by splitting the =
RGB=20
signals and the
> accompanying horizontal and vertical syncs =
into=20
separate coax cables
> and
> then back.  They cost =
in the=20
neighborhood of $50 to $100 and should not
> need a booster (we =
run a=20
50ft cable without a booster with no visible
> image =
loss).  Do not=20
use RCA or S-video connections; they will usually
> limit the =
resolution=20
to NTSC standards (approx. 720 x 480) and will
> always
> =

diminish the color resolution.  If you have component outputs on =
your=20

> card
> and inputs on your projector you could run coax=20
connectors for these
> as an
> =
alternative.
>
> Gary=20
Steinberg
>
> On Sat, 6 Sep 2003, RICHARD PICCIONI=20
wrote:
>
>> What's the best way to connect our =
demo-table PC to=20
a multimedia
>> projector so the two can be separated by a =
distance=20
of about 12-15 >> ft?
>>
>> Some=20
specifics:
>> PC running Windows 2k; Panasonic PTL-557U or =
Mitsubishi=20
SL-1
>> projector.
>> We tried an ATI Radeon 7000 =
video=20
card and an RCA wire, but image
>> quality was truly lousy =
at every=20
setting we could find.
>>
>> Thanks,
>> =
Richard=20
Piccioni
>> Garfield High School
>> Seattle =
WA
>>=20
=
href=3D"mailto:rgpiccioni@seattleschools.org">rgpiccioni@seattleschools.o=
rg
>



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From dstille@newton.physics.uiowa.edu Thu Sep 11 14:36:05 2003
Date: Thu, 11 Sep 2003 14:00:22 -0500 (CDT)
From: Dale Stille
X-X-Sender: dstille@newton
To: tap-l@listproc.appstate.edu
Subject: Re: 5D40.30 - radioactive discharge
In-Reply-To:
Message-ID:
References: <8DB9C75E-E201-11D7-B96B-000393B080FA@valpo.edu>

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Tappers,

I was showing my radioactive camera lens to some faculty this week when
one of them told me about another radioactive device for use with cameras.
I turns out that most good camera stores sell a lens brush that has a
small polonium 210 source in it. Cost is around $20. So, I got one and
tried it out in place of my high priced licensed americium source for
discharging a negatively charged electroscope or charged parallel plates.
Worked just fine at distances of 5 cm or less. For those of you wishing
to do or develop this demo it would be a cheap and hassle free
alternative.

Dale Stille
U of Iowa
From hubisz@mindspring.com Thu Sep 11 14:46:45 2003

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