Date: Sun, 21 Sep 2003 08:24:51 -0500

Author: Andrew Yue

Subject: Re: broken barometer-alternative

Post:

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David,

Make a *model* of a barometer with a tall test tube inverted into a beaker
of water and place the apparatus into a Bell jar. You should see the effect
of reduced air pressure as soon as you turn on the vacuum pump.

Assemble the *model* underwater in a lab sink. It's not perfect, but it
gets the point across.

At 07:32 AM 9/21/03, you wrote:
>Loved the suggestion concerning using PVC hose to construct a water
>barometer. I have done this on a number of occasions to demonstrate that
>this can be done BUT dissolved gas in the water results in bubbles coming to
>the top and as well a certain amount of water vapour adds to the above water
>level deficiency spoiling the accuracy of the device and the tubing tends to
>change cross section in the process. A lovely exercise in analysis can
>result. I was fortunate in having a long stairwell to construct the
>barometer.
>
>How did Torricelli get his apparatus constructed ?
>
>The story I heard had a transparent tube stuck out the thatch at the top of
>his cottage with a floating doll which responded to weather changes by
>hiding when inclement weather was due. Has anyone further details ? What
>did he make his tube out of ?
>
>David
> >
> >Why do you want a Hg barometer anyway. For much less money and lab real
> >estate, you can get a digital barometer. You can find these at Ben
> >Meadows (http://www.benmeadows.com/). That's a very cool catalog if
> >you've never seen it. If you are interested in showing the principle,
> >then just make a water barometer out of a length of PVC hose.
> >
> >Sam
> >

All the best,


- Andrew Yue -
Physics Lecture Demonstration Office
(512) 471-5411 Mon-Fri 8 am - 4 pm
yue@physics.utexas.edu
http://www.ph.utexas.edu/~yue

"The ultimate weakness of violence is
that it is a descending spiral, begetting
the very thing it seeks to destroy.
Instead of diminishing evil, it multiplies it. "
- Martin Luther King, Jr.




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Content-Type: text/html; charset="us-ascii"


David,


Make a *model* of a barometer with a tall test tube inverted into a
beaker of water and place the apparatus into a Bell jar. You should see
the effect of reduced air pressure as soon as you turn on the vacuum
pump.


Assemble the *model* underwater in a lab sink. It's not perfect, but it
gets the point across.


At 07:32 AM 9/21/03, you wrote:

Loved the suggestion concerning
using PVC hose to construct a water

barometer.  I have done this on a number of occasions to demonstrate
that

this can be done BUT dissolved gas in the water results in bubbles coming
to

the top and as well a certain amount of water vapour adds to the above
water

level deficiency spoiling the accuracy of the device and the tubing tends
to

change cross section in the process. A lovely exercise in analysis
can

result.  I was fortunate in having a long stairwell to construct
the

barometer. 


How did Torricelli get his apparatus constructed ?


The story I heard had a transparent tube stuck out the thatch at the top
of

his cottage with a floating doll which responded to weather changes
by

hiding when inclement weather was due.  Has anyone further details
?  What

did he make his tube out of ?


David

>

>Why do you want a Hg barometer anyway.  For much less money and
lab real

>estate, you can get a digital barometer.  You can find these at
Ben

>Meadows
(http://www.benmeadows.com/). 
That's a very cool catalog if

>you've never seen it.  If you are interested in showing the
principle,

>then just make a water barometer out of a  length of PVC
hose.

>

>Sam

>


                
All the best,




               
- Andrew Yue -

Physics Lecture Demonstration Office

(512) 471-5411  Mon-Fri  8 am - 4 pm

        
yue@physics.utexas.edu

   
http://www.ph.utexas.edu/~yue


"The ultimate weakness of violence is

that it is a descending spiral, begetting

the very thing it seeks to destroy.

Instead of diminishing evil, it multiplies it. "

- Martin Luther King, Jr.







--=====================_5179918==_.ALT--
From cablem@wfu.edu Sun Sep 21 20:10:53 2003
Message-ID: <3F6E644D.1080701@wfu.edu>
Date: Sun, 21 Sep 2003 22:54:05 -0400
From: Machele Cable
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To: tap-l@listproc.appstate.edu
Subject: Re: broken barometer
References: <006c01c37df5$55716460$96503593@RickTarara> <5.2.1.1.1.20030918132142.00b1f158@physics.montana.edu> <00d601c37e4f$7abc41e0$92c2d2cc@toshibauser> <3F6AFF6A.7000604@physics.syr.edu>
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And don't forget to tell all of US what company you dealt with, AND make
sure THEY know you told an entire email list serve what company gave you
such lousy service. Word of mouth advertising, good and bad, is really
what makes or breaks a company. It's obvious that the barometer is
defective. Try playing hard ball...let them know you know all of us.
We're a big pool of potential customers and that carries a lot of
power...if they don't realise that, they won't be in busines long. And
you shouldn't even be responsible for the shipping...because its going
to require special handling due to leakage...which wouldn't be a problem
is the product wasn't defective.

Chele

sampere wrote:

> You don't want to mess with Hg. I think you know that dropping this
> thing in the hallway is not an option. $280 seems a lot to fix
> something that is essentially static when it's only 2 years old. I'd
> expect the company to repair the barometer at no charge. When you get
> down to it, you can buy another barometer from another company for
> about the same price as the cost to repair (+ shipping, + the box)
> your current one. And swear never to do business with the original
> company.
>
> Why do you want a Hg barometer anyway. For much less money and lab
> real estate, you can get a digital barometer. You can find these at
> Ben Meadows (http://www.benmeadows.com/). That's a very cool catalog
> if you've never seen it. If you are interested in showing the
> principle, then just make a water barometer out of a length of PVC hose.
>
> Sam
>
> Bill Reitz wrote:
>
>> A Chemistry teacher came to me today about a mercury barometer he had
>> in the
>> classroom at our high school. Students noted a couple of drops of Hg
>> on the
>> outside of the bottom of the apparatus. He said there also seemed to
>> be a
>> bubble in the mercury column. The barometer is only 2 years old and
>> cost a
>> whopping $400. He called the company that manufactured it. They said
>> to mail
>> it to them and they would reseal and refill it ( for $280). They also
>> said
>> that it had to be sent in a special box ( they'll provide one for $40).
>>
>> The Chemistry teacher didn't know whether to send it back to be
>> refurbished
>> for big bucks or just drop it in the hallway so that we could have a few
>> days off. At nearby elementary school a small mercury spill was found
>> on the
>> floor in a science room. The school has been closed for a week. There
>> is a
>> rumor that a custodian collected the spill & poured it down the drain
>> ("I
>> didn't know it was mercury...") All the drains were sucked clean and
>> some
>> sealed off as a result.
>>
>> My question: what would you do with our troublesome barometer?
>>
>> Bill Reitz
>>
>>
>
>
>

--
~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~
Machele Cable Lab Manager Physics WFU
Phone: (336) 758-5532 Fax: (336) 758-6142
~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~
Friends are the Bacon Bits in the salad bowl of life.
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There's a thin woman inside of me trying to get out,
but I can usually shut her up with some chocolate!

From gnunes@mailaps.org Sun Sep 21 20:39:25 2003
Message-ID: <3F6E6AF5.4B0BA7B4@mailaps.org>
Date: Sun, 21 Sep 2003 23:22:29 -0400
From: gnunes
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To: tap-l@listproc.appstate.edu
Subject: Re: broken barometer
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David Eric Bailey wrote:
>
> Loved the suggestion concerning using PVC hose to construct a water
> barometer. I have done this on a number of occasions to demonstrate that
> this can be done BUT dissolved gas in the water results in bubbles coming to
> the top and as well a certain amount of water vapour adds to the above water
> level deficiency spoiling the accuracy...

Try vegetable oil. (You'll need an extra 3 feet or so in that
stairwell.)

-Geoff Nunes
From grahamaj@appstate.edu Mon Sep 22 06:47:45 2003
Date: Mon, 22 Sep 2003 09:30:11 -0400
From: AGraham
Subject: [Fwd: Virus alert-TAPL'ers]
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Date: Mon, 22 Sep 2003 00:30:24 -0400
From: Gordon Shepherd
Subject: Virus alert-TAPL'ers
To: Andrew Graham
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Andy,
It's Gordon again. I was starting to send this to the listserv but I
wasn't sure if the server checks it for viruses. I didn't want to send
this out to all TAPLer's if it might give them the very virus I'm trying
to warn them about. So I thought either you have what it takes to take
care of it or you are already "infected" and I'd let you make the
decision as to what would be best. Are you familiar with hoaxinfo.com?
This virus or one identical to it is there. I put references to it
below. You can forward my message to all if you feel it's safe.
Gordon


TAPLer's:
Andy Graham sent out a caution about an email that has a virus and its
one that disables antivirus programs. I received one which had as the
subject: "Security pack" and the sender was : "Microsoft Program
Security Center (xdjlncmduwuuyke@updates.microsoft.com)" . I put ( )'s
instead of < >'s for safety reasons. I didn't want to contact them! Do
not even open it! You might have already gotten one of these.Go to the
address below to get more info on it.. To check on this and other
viruses and suspicious email go to www.hoaxinfo.com. They forwarded me
to the site below and the appearence confirms that it is the same virus
or family of viruses. I have a question. If this has been on the
internet long enough for it to be on hoaxinfo.com, why doesn't
microsoft find a way to let everyone know about it before everyone gets
it? Are they "in" with the Antivirus software folks? Linux is
beginning to look mighty good.
Gordon Shepherd


http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=WORM_SWEN.A


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