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2 frosted glass disks

2 frosted glass disks

American
1910-1940
2 neutral density filters

2 neutral density filters

Globe Optical Company
1900-1920
2 neutral density filters

2 neutral density filters

American
1910-1940
mounted 7" x 8" red filter, W-28A - MA series

mounted 7" x 8" red filter, W-28A - MA series

American
1923-1950
polarizing filter envelope

polarizing filter envelope

Edmund Salvage Company
1942-1950
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The Collection of Historical Scientific Instruments
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p. 617-495-2779 • f. 617-496-5794
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