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Plate Holder Assembly


This object consists of a long brass-coloured tube of a fixed width attached at one end to a wooden assembly, which is painted black. The tube is attached by being held in a circle cut in wood slightly larger than tube; this has then been tightened by means of a large screw bolt. The wooden assembly is designed to hold a wooden plate with a filter; this can be slid out and is held in place by knurled knobs screwed into broad washers. The filter is yellow, and translucent.

Accession Number: 2019.ast.129 (DAA-0124)

Alternative Name:

Primary Materials:

Metal: Copper Alloy, Wood, Glass or Plastic

Markings: None.

Dimensions (cm): Length = 25.4, Width = 16, Height = 35


This assemblage appears to be constructed to hold a filter or lens in place, and direct light through it.


Very good: The metal of the tube is in very good condition, with no signs of corrosion. It is slightly dulled and marked in a regular pattern. The wooden assemblage is chipped and scraped in places; this is clear where the paint has been worn off.

Associated Instruments:

Manufacturer: Locally made

Date of Manufacture: 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:

Historical Notes: