Note 102 — Chapter IX · THE ART OF WORKING GLASS
Reading edition
Fluor-spar is calcium fluoride; you can buy it of Eimer and Amend, 4th Ave. and 18th St., New York, or of the L. E. Knott Apparatus Co., Boston, Mass.
Reading edition
Fluor-spar is calcium fluoride; you can buy it of Eimer and Amend, 4th Ave. and 18th St., New York, or of the L. E. Knott Apparatus Co., Boston, Mass.