Grain Numbers
Grain numbers define the size of the grain. The number corresponds to the number of meshes per linear inch in the grading sieve. Common numbers are, from coarse to fine: 10, 12, 14, 16, 18, 20, 24, 30, 36, 40, 46, 54, 60, 70, 80, 90, 100, 120, 150, 180, and 200. Grains finer than 200 are known as "flour" and are designated by the letters: CF, F, FF, FFF, FFFF, and PCF or SF (coarse to fine). Note that the grades for flour are not standardized, so the same grade grains from different sources may differ in size slightly.
Read more about this topic: Emery (mineral)
Famous quotes containing the words grain and/or numbers:
“He never doubts his genius; it is only he and his God in all the world. He uses language sometimes as greatly as Shakespeare; and though there is not much straight grain in him, there is plenty of tough, crooked timber.”
—Henry David Thoreau (1817–1862)
“All ye poets of the age,
All ye witlings of the stage,
Learn your jingles to reform,
Crop your numbers to conform.
Let your little verses flow
Gently, sweetly, row by row;
Let the verse the subject fit,
Little subject, little wit.
Namby-Pamby is your guide,
Albion’s joy, Hibernia’s pride.”
—Henry Carey (1693?–1743)