A Royal Microscopical Society Standard Thread Tap & Die Set
English, dated 1897, tap engraved 'Whitworth Manchester.8018 36ths' to one side and 'R. MIC SO LONDON 1897' to the other, die engraved '7967', in fitted leather covered case
Footnote: see the report written by Conrad Beck 'The Royal Microscopical Society's standard screw-tread for nose-piece and object-glass of microscopes' JRMS 1896 P389.-92.
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English, dated 1897, tap engraved 'Whitworth Manchester.8018 36ths' to one side and 'R. MIC SO LONDON 1897' to the other, die engraved '7967', in fitted leather covered case
Footnote: see the report written by Conrad Beck 'The Royal Microscopical Society's standard screw-tread for nose-piece and object-glass of microscopes' JRMS 1896 P389.-92.