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Catalogue number #1775832855
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| Triple prism eyepiece by Hilger 1 | Triple prism eyepiece by Hilger 2 |
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Telescope eyepiece for astronomical spectrum analysis by A. Hilger, London. Two fixed and one rotating prism plus lens. Diameter 0.75". The firm of Hilger had an international reputation for instruments used in astronomical spectroscophy.
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