Spectrograph part

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Circular felt pad lined with black velvet.

Part of the Yapp Slitless Spectrograph used at the Royal Observatory in the 1930s.

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ID:	AST1177.3
Type:	Spectrograph part
Display location:	Not on display
Creator:	Unknown
Date made:	Unknown
Parts:	Slitless Spectrograph for the Yapp Telescope Spectrograph part (AST1177.1) Spectrograph part (AST1177.2) Spectrograph part (AST1177.3) Nut and bolt (AST1177.4) Nut and bolt (AST1177.5) Nut and bolt (AST1177.6)