The fond contain compilation of Photographs, Newspaper Clipping, Pamphlets, Correspondence to Chinthamani Ragoonatha Chary and Transit of Venus.

The fond contain compliation of Photographs, Newspaper Clippings and Correspondence to M.K. Vainu Bappu and Institutes

This fond contains materials related to C. M. Smith that has general local office materials including letters of all local government and administrations. The letters pertaining to conference proceedings, and correspondences from International Scientists. A large portion of the collection was associated with information on observation.

This fond contains official letters related to Charles P. Butler during 1903-1904. It includes communications with the Meteorological Reporter, the Government of India and Director General of Indian Observatories, Simla, and the Officer Commanding Royal Engineers, Madras.

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.

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.

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

This letter was about the speech given by Dr. Bappu at IAU-2nd Asian Pacific meeting in Astronomy, Bundurg, Indonesia, August 25-29, 1981. He appreciated the progress of Indonesia in astronomy and its interest to do more.

This letter was about an elaborative lecture given by M. K. Vainu Bappu on scientific development in India and the contribution of India's eminent personalities. The role of astronomy and the key areas that astronomical celebrities have contributed to in India and the World.

The letter discusses about the report to be prepared by A.Fowler for IAU commission on standard wavelenth and he asks John Evershed for any special suggestions to add in the report.