  We report on the design and implementation of a rotating sample magnetometer
(RSM) operating in the variable temperature insert of a cryostat equipped with
a high-field magnet. The limited space and the cryogenic temperatures impose
the most critical design parameters: the small bore size of the magnet requires
a very compact pick-up coil system and the low temperatures demand a very
careful design of the bearings. Despite these difficulties the RSM achieves
excellent resolution at high magnetic field sweep rates, exceeding that of a
typical vibrating sample magnetometer by about a factor of ten. In addition the
gas-flow cryostat and the high-field superconducting magnet provide a
temperature and magnetic field range unprecedented for this type of
magnetometer.
