Filar Definition

Filar Sentence Examples

• When equatorial mountings for telescopes became more general, no filar micrometer was considered complete which was not fitted with a position circle.'

• A still further facility was given to the use of the filar micrometer by the introduction of clockwork, which caused the telescope automatically to follow the diurnal motion of a star, and left the observer's hands entirely at liberty.'

• The latter are in fact little microscopes carrying a vernier etched on glass, in lieu of a filar micrometer.

• We have not had an opportunity of testing this, nor Grubb's more recent models; but, should it be found possible to produce such images satisfactorily, without distortion and with an apparatus convenient and rigid in form, such micrometers may possibly supersede the filar micrometer.

• The method originally used by Huggins, who first conceived and proved the possibility of measuring stellar velocities in the line of sight, was to measure with a filar micrometer the displacement of some well-known line in a stellar spectrum relative to the corresponding line of a terrestrial spectrum.