from The Century Dictionary and Cyclopedia
- n. A special form of tripod-head for photographic cameras or surveyors' plane-tables, by which the plane of the table can be adjusted to be normal to any line, and free adjustment horizontally or in azimuth be subsequently made without changing the position of the normal: useful in taking panoramas by photography. The usual ball-and-socket mounting is retained, but in addition a conical axis in the ball gives a separate adjustment without disturbing the ball.
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