'Micrometer' mechanism
- maker:
- E Zimmermann
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Science Museum Group
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'Micrometer' mechanism, incomplete - brass 'pencil' missing. Used to test 'just noticeable differences' (J.N.D.), scale measured to 0.1 mm, by E. Zimmerman, Leipzig and Berlin, 1920-1939. (BPS Inv. No. 0074)
