I am an oceanographer helping out on an exhibit to open this spring at the
Anchorage Museum. I've been investigating pendulum experiments performed in
the period 1820-1840 by a number of individuals such as Hall, Kater, Leutke,
etc.   The primary purpose in many of these explorations was to determine
the shape of the Earth and variation of g.   I need some help.

Does anyone know where I might find a museum that has an invariable pendulum
to loan us for our exhibit? What is the difference, if any, between an
invariable pendulum and the seconds pendulum.  The term invariable is often
used, and I don't know if this is a special type of pendulum.

I am not a regular reader of this listserv, but my email address is
[log in to unmask]

Thanks to anyone who might point me in the right direction.

Richard Myers
Alaska Pacific University

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