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contact goniometer
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contact goniometer

measurement instrument
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A contact goniometer is an instrument used for measuring angles, particularly in the study of crystals. It was first devised by Arnould Carangeot in 1783. This type of goniometer consists of two metal rules joined at a pivot on a graduated semicircle. To use it, the instrument is positioned so its plane is perpendicular to an edge between two crystal faces. The rules are then brought into contact with these faces. The angle between the rules, as indicated on the semicircle, reveals the angle between the crystal faces. The rules can be shortened to measure crystals embedded in their matrix, making it useful for approximate measurements of larger crystals.1

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