A new design of an instrument for adjusting crystals from X-ray photographs

Some years ago a new method, and an instrument based on this method, for setting up crystals was described by the author. Application during the last few years has resulted in an improved instrument. Optical and mechanical means are used to find corrected settings for the arcs of a goniometer head from suitable X-ray photographs by simple mechanical manipulations and readings from scales on the instrument. The main advantages of the method are: the procedure of setting up a crystal is simplified (operation of the instrument is easily learned and quickly done) and time is saved (decrease of exposure time, decrease of evaluation time). The accuracy of the method is comparable to the accuracy of the usual setting methods.