Date: Sat, 03 Apr 2010 17:19:55
Author: chuck britton
Subject: Re: vacuum demo safety
All 9-volt batteries have not been created equal over the years.
Early ones tended to be a stack of six flat packs of zinc + goo +
carbon with a plastic wrapper shrunk around the stack.
More recent ones have been a collection of six parallel cylindrical
cells (sub-AAA size).
At 12:57 PM -0700 4/2/10, Bernard Cleyet wrote:
>The 9 V. surprises me as they are not well hermetically sealed and
>they contain liquid.
>Not being well sealed prevents explosion tho. I suspect a very
>long pumping time (days) before a high vacuum achieved.
>On 2010, Apr 02, , at 11:46, Paul Nord wrote:
>> No problems with a 9-volt and a piezoelectric buzzer.
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