Hale Reflector Model Telescope


Accession Number: 2014.ast.31


This is a model of the 200″ Hale Reflector Telescope at the Mount Palomar Observatory in San Diego Country, California. It sits on a rectangular plywood base, painted grey, with grey supports at the narrower ends. One of these supports is lower, and supports the base of the telescope model. The other consists of two taller stands with a bar connecting the two; this holds the top of the telescope.

The telescope is cagelike, with two solid cylindrical sections on either side, connected at the lower base with a broad bar; this represents the equatorial mount, which can be rotated as a whole, representing the right ascension of the telescope. The telescope can be tilted within the mount, representing the declination of the telescope.

At the base of the telescope, there is a green disk; this represents the telescope’s 5m mirror. At the top end is another green section, where a long cylindrical piece is supported by wires in the centre of the telescope; this represents the prime focus cage and the central section which contains the Goude and Cassegraine mirrors.

Alternative Name: Mount Palomar Observatory Telescope

Primary Materials: Wood, Metal: Iron Alloy


On stickers affixed to the base of the mode: “200-IN REFLECTOR MOUNT PALOMAR OBSERVATORY.”
“University of Toronto – ASTRONOMY – David Dunlop Observatory.”

Dimensions (cm):

Base: Height=1.5cm, Width=30.5cm, Length=48cm. Telescope: Height= 78cm (when in untilted position).


This telescope was built at the David Dunlap Observatory as part of a set of educational models of large telescopes, designed to show how different telescopes could be adjusted and used.


Fair: The wood and paint of the model is in good condition, although worn and chipped in paces. The model still rotates well. The prime focus cage portion of the model is held together by wires and screws: these are pulling away from each other, and this portion of the model is very delicate and in poor condition.

Associated Instruments: 2014.ast.23


The Workshop at the David Dunlap Observatory, Richmond Hill

Date of Manufacture: 1952-1953


This model, with three others, was constructed at the David Dunlap Observatory in Richmond Hill in or just before 1953. It was kept there until the University of Toronto sold the Observatory in 2009, at which point it was moved to the Department of Astronomy & Astrophysics U of T’s St George Campus along with other objects from the Observatory. In 2017, the model was moved to another storage location in the McLennan Physics Building.

Additional Information and References:

Description of The 200-inch (5.1-meter) Hale Telescope from the Palomar University.

Historical Notes:

These models are described in the Dunlap Observatory’s 1953 update in Notes from Observatories in the Journal of the Royal Astronomical Society of Canada, Vol. 47, p.96: “A number of demonstration models depicting the largest telescopes in present use have been constructed in the shop of teh David Dunlap Observatory. Built to the scale of one-quarter inch to the foot, these moving models were intended to demonstrate the advantages and drawbacks of the various methods of mounting an astronomical telescope. While primarily intended for the classroom, the models were displayed at the recent At-Home of the Royal Astronomical Society of Canada and at the Canadian Hobby and Homecraft show where they were viewed with lively interest. The limitations of a telescope mount or its ease of handling can be graphically demonstrated with models in a manner not possible with only diagrams and explanations.”