EXAMPLE SENTENCES FROM THE WEB
Transit Instrument, with reversing arrangement, illumination with oil or electric lamp, Filar micrometer with two eye pieces.
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.
Place the filar micrometer and the stage micrometer in their respective positions.
(c) By means of the Filar Micrometer (Ramsden's micrometer eyepiece).
In the filar micrometer two spider lines are parallel, and one intersects them at right angles.