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LEITZ SCREW COVER-GLASS MICROMETER
c 1924-1930
This is a screw micrometer integrated into a base. I have yet to find an actual example by Leitz, though we know it was sold in the 1920's through at least 1930. A
similar but more robust instrument by Zeiss
is shown on this site. For more about coverslip micrometers see the
History of Coverslip Micrometers page.