Monitored Geiger counter X-ray diffractometer with automatic recording

The equipment produces automatically a compact photographic record of a step-scan of a powder diffraction pattern in steps of 0.02° (2θ). It is arranged that movement over the background region between lines is rapid, so that only the line profile and the immediate background on either side are recorded in detail. The specialized electronic circuits and the relay-operated automatic sequence control circuits are described, together with a special automatic camera provided with various safety devices to protect the record. Facilities for other scanning procedures are also provided.