Micrometer filar
Micrometer filar a device attached to a telescope or microscope, consisting of a wire thread filament connected with a screw in such manner that as the screw is turned, the wire moves through a continuous succession of parallel positions, all in the focal plane of the instrument any small angle may be measured by noting the number of turns and fractions of a turn of the screw which are made in moving the wire from one bisection to another, and multiplying this by the value of one turn see micrometer ocular, micrometer microscope, and micrometer
Source: http://www.iho.int/iho_pubs/standard/S-32/S-32-eng.pdf
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