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

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 contains materials related to John Evershed that contains general local office materials including letters of all local government and administrations, proceedings, reports to the government of India etc., A large portion of the collection series contains information on observations from various scientists.

This fond is related to prisms from Kodaikanal Observatory

The fond contains correspondence related to Signaling Time from 1904 to 1923. It has letters from Thomas Royds, Gilbert T. Walker and the Director General of Telegraphs.

This font is regarding public works in Kodaikanal Observatory

This fond contains items related to the telescope purchased by Nawab Zafar Jung of Hyderabad.

The fond contain correspondence related to the building, as well as plans and estimates for the sliding roof of the spectroheliograph building.

This fond contains items from the proceedings of the Madras Government