A rectangular wooden box with a hinged lid contains 35 glass filters of varying colour and thickness. Most are square with a paper label listing identifying information at the top corner. Inside the lid is a label listing the code number and thickness of 23 filters.
Two unlabelled rectangular filters have a green tint and are slightly radioactive. These are likely of uranium glass and are stored separately.
Accession Number: 2022.ph.862
Primary Materials: Glass, Wood
Most filters are labelled with information including code number, material, and wavelength.
Height = 10; Width =10.5; Length = 50.5.
Optical filters are used to selectively transmit certain wavelengths of light.
Most filters have minor chips. Two have been cracked and repaired, one with tape. Four are coated with a white deposit. Most of the paper labels have some level of damage.
Manufacturer: Corning Glass Works. Corning, New York.
Date of Manufacture: Early 20th c.
This artifact was acquired along with several other items on August 25, 2021 from the undergraduate teaching lab of the Department of Physics.
Additional Information and References:
- Donated to UTSIC