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There is an exhibit I've seen several places, 
Science Museum of Minnesota most recently, 
(originated where?) that demonstrates a feather 
and a marble falling at the same rate in a vacuum 
and at different rates in air. Though I knew the 
principle seeing it was astounding.

My recommendation.

Cheers,

Martin


>
>Wayne,
>
>I've seen an exhibit that had a solenoid/rod 
>ringing a bell in a bell jar. The solenoid was 
>activated by visitors with a push button. The 
>bell jar was vacated by the vacuum pump and the 
>sound of the bell slowly died away.
>
>Dick Falkard
>
>-----Original Message-----
>From: [log in to unmask] [mailto:[log in to unmask]]
>Sent: Friday, January 30, 2004 8:31 AM
>To: [log in to unmask]
>Subject: Re: What To Do With A Big Vaccum Pump? An Exhibit?
>
>
>ISEN-ASTC-L is a service of the Association of 
>Science-Technology Centers Incorporated, a 
>worldwide network of science museums and related 
>institutions.
>*****************************************************************************
>
>Wayne,
>
>Edward's is a major manufacturer of vacuum 
>pumps. They make/ made several different kinds. 
>If you do an online search you can probably come 
>up with not only all the spec.'s but also 
>exploded views of all the little parts the thing 
>is made up with - as well as the parts you will 
>need to rebuild the thing if it has been sitting 
>around for a while.
>
>The motor size you quote indicates a huge vacuum 
>pump. Currently they offer a E2M40 which has a 
>capacity of 30 cfm - that's about 10 times 
>greater than any pump I've ever used in an 
>exhibit. This one only uses a 2 HP motor so I'm 
>it's unlikely that this is the same one you've 
>got.
>
>The chief advantage to a large pump in our case 
>is speed. It can evacuate a chamber relatively 
>quickly. This way visitors don't have to wait a 
>long time (30 sec to a minute) for a reasonable 
>vacuum to be reached.
>
>Usually vacuum pumps run continuously (though I 
>don't know about the type you've got) - you turn 
>a valve to connect the pump to the systems 
>rather than turn the pump on and off. It's 
>unlikely that you'd want to run a 25 hp motor 
>all day (assuming you even have the service 
>available to run it.)
>
>As far a what to do with it. You're guess is as 
>good as mine, but probably not as good as some 
>others out there.
>
>Joe R
>TheExhibitGuys.com
>
>
>
>Wayne Watson wrote:
>
>>  ISEN-ASTC-L is a service of the Association of Science-Technology
>>  Centers Incorporated, a worldwide network of science museums and
>>  related institutions.
>>  **********************************************************************
>>  *******
>>
>>
>>  Someone gave the museum what we call a large vacuum pump. It has a 25
>>  hp motor, is about 18" on a side, and says in large bold letters 40
>>  with the words Two Stages below it. The mfger seems to be Edwards. It
>>  looks like it would evacuate all the air from a large room. I may have
>>  been used in the semiconductor industry. Any suggestions on how we
>>  might use it for an exhibit?
>>
>>  --
>>       Wayne T. Watson (121.015 Deg. W, 39.262 Deg. N, 2,701 feet,
>>  Nevada City, CA)
>>                      -- GMT-8 hr std. time, RJ Rcvr 39° 8' 0" N,  121°
>>  1' 0" W
>>
>>        "Birds take off at sunrise. On the opposite side of the world,
>>  they are
>>        landing at sunset. This causes the earth to spin on its axis."
>>  -- Unknown
>>
>>                         Web Page: <home.earthlink.net/~mtnviews>
>>                         sierra_mtnview -at- earthlink -dot- net
>>            Imaginarium Museum:
>>  <home.earthlink.net/~mtnviews/imaginarium.html>
>>
>>  **********************************************************************
>>  *
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--
Martin Weiss. Ph.D.
Director of Science
New York Hall of Science
47-01 111 th Street
Corona, New York 11231
718 699 0005 x 356
718 699 1341 facsimile
917 626 1930 cell phone
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