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George W. Ritchey was a a gifted mechanical and optical engineer that played a key role in the early development of Yerkes Observatory of the University of Chicago. He perfected the technique of obtaining high quality photographs with a visually corrected refracting telescope, in this case the famous Yerkes 40-inch refractor, using isochromatic plates and a yellow filter. The method was tested by taking over 65 plates in 1900 and 1901. This set contains two positive and four negative plates with exposures of stars.

The series includes Cambridge lecture notes and thesis, correspondence and minutes from the Department of Applied Mathematics, material relating to the Yerkes Observatory, photographs of staff, glass plates of astronomical observations, and reprints of articles by Archibald Brown, notes for articles published in physics and mathematical journals. There are also several books in French, German and English.

Includes:

The First Hundred Years of Mathematics in the University of Sydney by Dr. I.S. Turner, Current Affairs Bulletin, Mathematics in Australia, Vol. 28, No. 4, June 1961

CSIRO Newsletter, 78, August 1981

An appreciation of Joseph Mark Gani, AMC, 1966-1984

An Anecdotal History of the Applied Mathematics Conference and the Division of Applied Mathematics by R.D. Braddock

Includes:
Mathematical note 2765: Motion of a top: a criterion for loop motion, Mathematical Gazette, 1958, 42, pp. 129–131

Reprints from Australian Mathematics Teacher: A property of the tetrahedron, Vol. 20, No. 2, 1964

The SHM equation: an alternative treatment, Vol. 23, No. 1, 1967, A logging problem, Vol. 24, No. 2, 1968

Mathematical note 3111: On the real roots of an equation. Solution and discussion, Mathematical Gazette, 1965, 49, no. 367, pp. 77–8

A vector method for a geometrical problem, Australian Mathematical Society Gazette, 1975, Vol. 2, p. 12

Note 64.20 By-passing an awkward turning, Mathematical Gazette, 1980, 64, pp. 273–4

Doubling the area of a table, Mathematical Gazette, 71, 1987, pp. 223–5

unpublished note: A summable series, The Sullivan star problem, Circuit, No. 107, April 1981

Symmetry and maximization, Circuit, second half of 1981

Trigonometric ratios in surd form, Mathematical Gazette, 1984, 68, pp. 48–51

Fast diffusion with loss at infinity – additional solutions, ANZIAM J, 42, 2001, pp. 445–50

Includes: The Motion of Groups of Stars, Matrix, 1963

Diffusion of heat from a sphere to a surrounding medium, Australian Journal of Physics, 1965, 18, pp. 483–9

A Diffusion Problem with Spherical Symmetry: Temperature Distribution for Different Initial Conditions, 1968

Temperature profiles in some heat conduction problems with spherical symmetry, Australian Journal of Physics, 1970, 23, pp. 935–40

Includes:
The derivation of the velocity ellipsoid from proper motions, Monthly Notices of RAS, No. 5-6, 1941

Mean parallax determinations from proper motions, Monthly Notices of RAS, Vol. 106, No. 3, 1946, Radial velocity estimates for four A-type stars, 1948

The rotational velocities of groups of stars, as determined from the apparent rotational velocities, Astrophysical Journal, Vol. 111, No. 2, March 1950

On the determination of the convergent point of a moving cluster from proper motions, Astrophysical Journal, Vol. 112, No. 2, September 1950

The color-magnitude array for stars in the globular cluster M15, Astrophysical Journal, Vol. 113, 1951

The color-magnitude array for stars in the globular cluster M13, Astrophysical Journal, Vol. 122, No. 1, July 1955

M15 Additional Notes, On the structure of a hydromagnetic prominence model, Astrophysical Journal, Vol. 128, No. 3, November 1958

One annotated on reverse IAU meeting Zurich 1948; one annotated on reverse Yerkes Observatory 29 April 1950; one unannotated; one framed black and white portrait of unknown male, unannotated.

Includes: Stella structure and Statistics notes, The Yerkes Observatory, Williams Bay, Wisconsin, The Ursa Major Group by Nancy Grace Roman, Yerkes Observatory (Astrophysical Journal, Vol. 110, No. 2, September 1949), London Mathematical Society, Notes on the Preparation of Mathematical Papers.