Date: Sat, 20 Sep 2003 19:21:21 -0700

Author: Paul Doherty

Subject: Re: Astronomy help


A great resource book full of Astronomy activities is "The Universe at Your
Fingertips" published by the ASP 9astronomical Society of the Pacific San

Paul Doherty

From Sun Sep 21 05:48:31 2003
Date: Sun, 21 Sep 2003 22:32:37 +1000
From: David Eric Bailey
Subject: Re: broken barometer
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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

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 ?

>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 ( 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.
From Sun Sep 21 06:41:58 2003