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impersonal micrometer

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impersonal micrometer [im′pərs·ən·əl mī′kräm·əd·ər]
(engineering)
An instrument consisting of a vertical wire that is mounted in the focal plane of a transit circle and can be moved across the field of view to follow a star, and instrumentation to record the position of the wire as a function of time; used to reduce systematic observational errors.


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