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short communications
A new high temperature technique is described, in which a thermocouple combines the functions of supporting the crystal, heating it, and temperature measurement. The thermocouple is mounted on the goniometer head. The sample is heated by passing a 50 c.p.s. current through one of the two arms of the thermocouple. Both the heating and measuring circuits can operate over complete cycles. The heating element can be readily incorporated in many existing Weissenberg and precession cameras and diffractometers. Both conducting and non-conducting crystals can be heated.