Date: Sat Mar 21 09:50:24 2009 Back to Contents ------------------------------------------------------------------------

Author: Thomas J. Bauer

Subject: Re: Magnets and Sea Urchins


Just normal earth's. About a gauss. I used to be able to measure this but
one of the lecturing folks lost my zero gauss chamber and I never got
around to
ordering a new one.

Tom writes:
>And... what was the field in the control tank which used the same water?
>On Mar 20, 2009, at 2:16 PM, Thomas J. Bauer wrote:
>> One of my into E&M students bowwored a Pasco Hemholtz coil and Power
>> supply for her
>> biology project. She put sea urchins in a magnetic filed for their
>> first
>> two weeks of growth.
>> They developed fine, but almost twice as fast as normal.
>> At the maximum continous current I measured a field of 30 gauss.
>> Tom B
>> Wellesley College

From Sat Mar 21 09:50:24 2009