filar micrometer
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fi·lar mi·cro·me·ter
an ocular micrometer with a line moved by a ruled drum such that a movement of the line of 5 mcm or less may be made in relation to fixed parallel lines.
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive
The biggest problem was that an adaptor plate for the
filar micrometer was missing and Brian had to get another one made.
It is here described and illustrated; it was treated in the usual way for mounting on a slide in Canada Balsam; the usual measurements, stated in ([micro]m, were taken with an AO
filar micrometer (measuring units 1.36 ([micro]m for wings, and 0.53 ([micro]m for other parts, see Garcia Aldrete 2006).
If you envision a double-star observer as a wizened old astronomer with a large-aperture refractor and a
filar micrometer, then think again.
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