MICROSCOPE-ANTIQUES.COM © 2013-18.
SEIBERT SCREW COVER-GLASS MICROMETER
c 1924
This is a screw micrometer integrated into a base. I have yet to find an actual example by Seibert though we know it was available about 1924. 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.