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Description: | '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. | License: | http://creativecommons.org/licenses/by-nc-sa/2.5/ | Subjects: | micrometer | Temporal: | 1920-1939 | Source: | Science Museum | Identifier: | 1994-1255/53 | Go to resource |
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