Origin of filar
Related formsin·ter·fi·lar, adjective
Examples from the Web for filar
Transit Instrument, with reversing arrangement, illumination with oil or electric lamp, Filar micrometer with two eye pieces.Astronomical Instruments and Accessories|Wm. Gaertner & Co.
To Bouguer in 1748 is due the true conception of measurement by double image without the auxiliary aid of a filar micrometer, viz.
It can be used to measure the angular distance between objects too far apart for the filar micrometer.The Story of the Heavens|Robert Stawell Ball
Place the filar micrometer and the stage micrometer in their respective positions.
(c) By means of the Filar Micrometer (Ramsden's micrometer eyepiece).