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Products

• Prism tiles, vault lights (manufactured by Jeannette Glass Co).
• Tiles in 3 grades, best to worse: Cut (tiles tested with polariscope; sized to 1/100th inch; polished and ground edges; prepared for electroglazing); Commercial (selected prisms; not tested, polished, or ornamented), and Factory (seconds, minor flaws).
• Refraction angle noted as A for canopies, J, K, L, M, N, O, S and P for normal sash and forilux use.