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Abstract
1. The adjustment of C. Leiss' two-circle goniometer according to the instruction of the maker shown as insufficient. Supplementary notes are given for the successful use of this instrument. 2. For the first time described prof. B. Popoffs two-circle contact goniometer constructed about 25 years ago and having proved itself adapted to the demonstration of the principles of two-circle measurements, thus serving an important purpose in instructional work in crystallography.