Pocket drum microscope, (by Martin, but not signed

Benjamin Martin

Buy this image as a print 

License this image for commercial use at Science and Society Picture Library

Science Museum Group
© The Board of Trustees of the Science Museum

Pocket drum microscope, (by Martin, but not signed) in green leather case; with accessories

This example dates from about 1770, and differs from the earlier instruments of this form in having adjustment for the condensing lens and in the form of the eyepiece.

There are two objectives, of 0.22in. and 0.33in. focus respectively. The lenses constituting the eyepiece are mounted in a separate inner tube, and consist of a field-lens of 1 3/8in. and a double eye lens of having an equivalent focal length of 5/8in. The field-lens is distant 2in. from the object lens and 1 1/2in. from the lens nearest the eye.


Object Number:
Court, Thomas Henry

Cite this page


We encourage the use and reuse of our collection data.

Data in the title, made, maker and details fields are released under Creative Commons Zero

Descriptions and all other text content are licensed under a Creative Commons Attribution 4.0 licence

Using our data


Download catalogue entry as json

View manifest in IIIF viewer

Add to Animal Crossing Art Generator

Download manifest IIIF

Our records are constantly being enhanced and improved, but please note that we cannot guarantee the accuracy of any information shown on this website.