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This fond was about pendulum clock used at the Madras Observatory manufactured sometimes in 1786. The clock is now in Kodaikanal Solar Observatory and still in working condition.

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.