filar

Over 10,000 filar-micrometer and red light CCD measurements of Mars' north polar cap have been taken over the past 40 years, and they show that it has been shrinking.

The polar-bears-on-the-melting-ice-cap photo. Ann Althouse 2007

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

Scientific American Supplement, No. 288, July 9, 1881 Various

Rotate the screw of the filar micrometer until the movable wire coincides with the fixed one, and the index marks zero on the drum head.

The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged.

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.

Scientific American Supplement, No. 623, December 10, 1887 Various

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.

Scientific American Supplement, No. 623, December 10, 1887 Various

Place the filar micrometer and the stage micrometer in their respective positions.

The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged.

At one end of the drum are gear teeth, 1 mm. apart on centers, which can be made to engage a worm revolving a pointer in front of a dial graduated to hundredths; by means of this and a filar eyepiece, the distance between the start of the two rows of spark dots on the drum can be measured accurately to 0.01 mm.

Transactions of the American Society of Civil Engineers, vol. LXX, Dec. 1910 Federal Investigations of Mine Accidents, Structural Materials and Fuels. Paper No. 1171 Herbert M. Wilson

Westfall, staring into the eyepiece of the filar micrometer, finished measuring the apparent size of the heptagon before he turned toward

Spacehounds of IPC 1927

A spider web, revealing its geometric perfection, hung half across one corner of the rude casement; the moonbeams without were individualized in fine filar delicacy, like the ravellings of a silver skein.

The Riddle Of The Rocks 1895 Mary Noailles Murfree 1886

All adown the desert aisles of the leafless woods the light lay with a flocculent glister like snow, so enhanced was its whiteness in the rare air and the blackness of the forest shadows -- spare, clearly drawn, all filar and fine like the intricacies of a delicate line engraving.

The Frontiersmen Mary Noailles Murfree 1886