Accession Number: 2009.ph.185
Instrument Name: Unknown
A large hollow cylinder is open on the bottom. There are threads on the inside of the cylinder, and a thick metal ring circles it about 2 cm from the bottom. The top has two metal slides that are mounted on springs such that they remain closed. A screw on the side, when turned, will push open the slides, making a long narrow slit that allows light to pass through the entirety of the cylinder.
Primary Materials: Metal
On the top of the cylinder is engraved “W. LADD”, “LONDON”.
Dimensions (cm): Height = 11, Diameter = 13.5
Manufacturer: W. Ladd (?), London
Date of Manufacture:
Provenance: Dr. Martin Lee’s Collection
Donated to UTSIC: No