Moulded Glass (or plastic)

From International Dictionary of Marine Aids to Navigation
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Alternative term: Pressed Glass (or plastic)

Glass (or plastic) formed into the shape required for optical purposes by allowing it to solidify from the molten state in a suitably shaped mould.




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM