Grades and Classifications
The 1973 U.S. federal procurement specification PPP-E-911, cancelled in 1991, categorized "wood excelsior" products according to the following table of terms and dimensions:
TABLE I. Strand size for type I class A and B excelsior ------------------------------------------------------------------------------- Thickness of strand Width of strand Grade Nomenclature Inch Inch ------------------------------------------------------------------------------- 1 Superfine wood wool 0.006 0.020 2 Wood wool 0.012 0.020 3 Extra fine 0.015 0.031 4 Fine 0.018 0.031 5 Medium 0.021 0.041 6 Coarse or ribbon 0.015 0.167 -------------------------------------------------------------------------------Read more about this topic: Wood Wool
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“He suggested that there might be men of genius in the lowest grades of life, however permanently humble and illiterate, who take their own view always, or do not pretend to see at all; who are as bottomless even as Walden Pond was thought to be, though they may be dark and muddy.”
—Henry David Thoreau (1817–1862)