These are two similar eyepieces. Each consists of a cylindrical brass tube with a lens set in one end, and a fixed black plastic eyecup. 2018.ast.90.1 is longer, 2018.ast.90.1 is shorter. The eyecups can be unscrewed from the lens and brass tube.
Accession Number: 2018.ast.90.1-2
Alternative Name: Lens
Primary Materials: Metal: Copper Alloy, Glass, Plastic
2018.ast.90.1: Length = 4.3, Diameter = 3.3; 2018.ast.90.2: Length = 3.6, Diameter =
These are attachments for an optical instrument.
Good: The brass surface of the lens tube is corroded and dirty from use. There are vertical scratches along the length of the tube of 2018.ast.90.1
Date of Manufacture: Early 20th Century
This object was likely moved from the David Dunlap Observatory in Richmond Hill in 2008, upon the sale of the observatory. It was stored at the Department of Astronomy and Astrophysics until 2017, when it was moved to a new storage location in McLennan Physical Laboratories.
Additional Information and References: