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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“Kindliness seems to exist primarily as an animal instinct, so deeply rooted that mental degeneracy, which works from the top down, does not destroy it until the mind sinks to the lower grades of idiocy.”
—Charles Horton Cooley (1864–1929)