  A magnetometer has been developed by a simple modification of the TEL-Atomic
Cavendish balance designed by the author. The usual tungsten wire fiber has
been replaced with a silk thread, and a rare earth magnet has been attached to
the boom near where the fiber connects. Because of the mechanical common mode
rejection feature of the instrument, pendulous noise is largely removed from
this compass-like magnetometer that is quite sensitive to direction changes in
the Earth's field.
