Derck's circular gauge dial

Derck's circular gauge dial

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Derck's circular gauge dial
Science Museum Group
© The Board of Trustees of the Science Museum

Derck's circular gauge dial, a ready reckoning calculator for pipes, drills and machine tools. Copyrighted by James Derck, c1925.

Details

Category:
Mathematics
Object Number:
1998-869
Materials:
cardboard and complete
Measurements:
2.54 x 127 mm
type:
ready reckoner (engineering)
credit:
Tesseract