“Henry T. Hellmers' Secret Batch Book of Glass Formulae” by J. W. Courter This is an important reference in glassmaking in America 1921-1965 Some of Mr. Hellmers' history and work experiences are included here. Various employment history notes when he worked at companies such as: Making marbles at AKRO Agate Company, Westite, Cambridge Glass Co., Making glass lamps at Aladdin Industries, Making Optics at Lancaster Lens Co., Owens Corning Fiberglass, Glass Fibers Co., Pittsburg Corning, Heisey Glass, Erickson Glass, L.J. Houze, Convex Glass Co. etc. His entire handwritten Batch Book including 2373 formulas detailing the coloring of glass batches has been reproduced in sections; Alabaster or Opalescent, Moonstone, Opal, Black or Ebony, Transparent Color, Crystals, Special Use Glasses, etc., each with numerous color formulas! over 400 pages 6" X 9" Paperback ISBN: 978-0-9837038-1-5 $50 USD Order online from: http://www.igneousglassworks.com/product/henry-t-hellmers-secret-batch-book-of-glass-formulae-jwcourter