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This fond contains photographic plates of Comet Wilson in 1987 viewed from Kavalur using the 90" telescope under various atmospheric conditions

This fond contains letters, several photographs, and observations related to A. A Narayana Ayer during the year 1913-1920.

The fond contain correspondance of M. K. Vainu Bappu with C. V. Raman and mentors, donated by Mrs. Yemuna Bappu to IIA archives.

This fond encompasses materials centred around the achromatic telescope and its diverse mountings. It features detailed figures of the telescope and incorporates a comprehensive catalogue of instruments crafted by Troughton and Simms.

Madras M.S. Records was an important handwritten document maintained by M. Topping (1789-1796) and J. Goldingham (1796-1805), who were early astronomers of the Madras Observatory. The establishment of the Madras Observatory in 1786 was mentioned in this record.

This was a handwritten record of observations made at the Madras Observatory by J. Goldingham (1796- 1805). It records the correspondent eclipses of the first and second satellites of Jupiter at the Madras Observatory and of Musalipatam, which were determined by timing immersions and the emersions of the first and second Satellites of Jupiter. The record consists of 163 pages and is not in good condition.

A Treatise on Spherical Astronomy by Robert Stawell Ball was a work on positional or spherical astronomy. It was first published in 1908. It has 506 pages.The book covers various areas of study, including fundamental formulae, determination of coordinates, atmospheric refraction, the theory of cartography, and more. It assumes a good level of geometry and trigonometry knowledge from readers.

This fond includes a comprehensive catalogue of the main fixed stars compiled at the East India Company's Observatory in Madras.

These photographic slides contain Sidney Harris astronomical cartoons.

These Photographic slides contain the observations of the survey from the Mt. Nimmu base.