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This fond contains official letters, photographs, and administrative files related to P. R. Chidambara Ayer during the years 1919-1932.

The font contains letters, correspondence, life, achievements and participation at National and International level of Dr.M. K. Vainu Bappu

This fond consist of newspaper clippings on the awards received by IIA scientist, commission of the new telescope at Kavalur and uneviliation of M. K. Vainu Bappu's statue.

This fond consist of newspaper clippings on the discoveries that was made from the indian soil in early 17th century.

This fond consist of newspaper clippings on the life time journeys of various scientists, astronauts, and professors from India and abroad. The articles also discuss the books that have been written about these individuals, highlighting their achievements and contributions to their respective fields.

This fond contains medals and awards received by Dr. M. K. Vainu Bappu

The book is a collection of memoirs on the various modes according to which the nations of southern parts of India divide time written by Lieutenant Colonel John Warren in 1825.

This fond contains official letters related to William Butler from March to November 1908.

This fond contains letters, annual expenditure reports and bills of Kodaikanal and Madras Observatories. It also contains correspondence of John Eliot,Charles Michie Smith and R.E.V.Arbuthnot during July 1901 to March 1903 regarding the index slip, meteorological summaries, seismological reviews and disturbances and other reports like annual expenditure, bills, and telegraphs. It has a report on the condition and proceedings of the government observatory, Colaba, written by N.A.F.Moos. It also has letters from the Royal Society of India, H. Grubb, J. Larmer, R. Fuess, William Butler and Charles P. Butler to the Meteorological Department and Kodaikanal & Madras Observatory.

Seven official letters pertaining to Gilbert T. Walker from 1903 to 1912 are included in the fond. This includes correspondence between Gilbert T. Walker and the Director of the Kodaikanal Observatory and the Meteorological Reporter to the Government of Madras.