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Norville Check List No 12 - Centre Substance - Plus Powers
ARCHIVAL ITEMS
selection chart; catalogue
Norville Optical Company Limited
Europe: United Kingdom, England, Gloucestershire, Gloucester
June 1992
paper
overall: 210 x 296 mm
2006.828
ARCHIVAL ITEMS
selection chart; catalogue
Norville Optical Company Limited
Europe: United Kingdom, England, Gloucestershire, Gloucester
June 1992
paper
overall: 210 x 296 mm
Selection chart tabulating the available average centre substances for different index lens materials at various diameters. A4 landscape format, printed in black on one side only of a single sheet of white paper.
2006.828
Gift of the Norville Group, 2006