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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 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.

The fond contains documents of Thomas Royds, the past director of Kodaikanal Solar Observatory. It consists of mainly official letters, administrative documents, pay slips and handwritten documents related to Thomas Royds.

The album contains photos related to the Solar Physics Observatory at Kodaikanal during Dr Anil Kumar Das's directorship. It was established in 1899 as a Solar Physics Observatory, and all the activities of the Madras Observatory were shifted to Kodaikanal. The photographs in this album illuminate the critical events in the history of the Kodaikanal Observatory from 1946 to 1955. The visit of eminent scientists and astronomers, official meetings and conferences, celebrations, and farewells and staff of the observatory during the period can be seen in the album.