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2 prisms in box
Crookes
Mid 20th c.
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Binocular Prism Vergence Tester
Early-mid 20th c.
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Glass cube
Late 20th c.
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Landolt's Double Prisme & case
L. Giroux
c.1920s?
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Maddox Bi-Prism
Mid 20th c.
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Prism Bar
Clement Clarke Ltd
Mid-late 20th c.
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prism trial case & frame
Clement Clarke Ltd
Mid-late 20th c.
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prism trial case & frame
Theodore Hamblin Ltd
Mid-late 20th c.
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prism trial set
Early 20th c.
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prismatic spectacles
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prismatic spectacles
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Set of miscellaneous lenses and prisms
Max Kochmann Ltd; Optolis
1960s
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Set of Porro Prisms
Mid 20th c.
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Stock 3016 Pentagon Prism
Edmund Salvage Company
Late 20th c.
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The Light Crystal
Tedco; BellTree Fun & Science
1986; 1999
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variable prism
20th c.
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variable prism
Cretes, A.
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variable prism disc
Mid 20th c.
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variable prism disc
Mid-Late 20th c.
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variable prism disc
Theodore Hamblin Ltd
Mid 20th c.
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