Crossword-Solution: FILAR 5 letters, 20 clues 🏆 scrabble score: 8

Bifilar micrometer (often called a bifilar), an instrument form measuring minute distances or angles by means of two very minute threads (usually spider lines), one of which, at least, is movable; Ð more commonly called a filar micrometer.

For several thousand years the stars have been called "fixed," but the fine rulings of the filar micrometer tell a different story.

Its segments are separable to the extent of 2°, and through the contrivance of cylindrical slides (originally suggested by Bessel) perfect definition is preserved in all positions, giving a range of accurate measurement just six times that with a filar micrometer.

Wolf and Pritchard had, it is true, been beforehand with him; but the wide scattering of the grouped stars puts the filar micrometer at a disadvantage in measuring them, producing minute errors which the arduous conditions of the problem render of serious account.

Quince, you're the brains of this outfit--shift the massive old intellect into high and tell us what to do." Westfall, staring into the eyepiece of the filar micrometer, finished measuring the apparent size of the heptagon before he turned toward Stevens and Brandon.