A single‐crystal orientation technique using doubly exposed Weissenberg photographs

A new technique to determine the orientation of a single‐crystal is presented. The technique utilizes two screenless Weissenberg oscillation photographs taken in the same crystal oscillation range but with different film‐translation‐to‐crystal‐oscillation gear ratios. The technique is especially useful for small‐molecule single‐crystal data‐collection systems using an imaging plate as an area detector. A program system was written and successfully applied to an imaging‐plate diffractometer (IPD‐WAS) designed for studying phase transitions in the crystalline state.