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This is a letter from Gilbert T. Walker to Charles Michie Smith informing that there might be difficulty in getting clocks from the mathematical instrument department.

This is a letter from Charles Michie Smith, the Director of Kodaikanal and Madras Observatories to Gilbert T. Walker, the meteorological reporter to the government of India acknowledging the receipt of the drum.

This is a letter from the director general of observatories culcutta to John Evershed, Director of Kodaikanal and Madras Observatories informing that the thermograph clock currently used stops working very frequently though it was repaired last year. It also requests for a new thermograph clock to be sent at the earliest.

This is a letter from S. R. U. Savoor Deputy Director Madras Observatory to the Director General of Observatories Simla informing that there is no connection in practice between humidity of air and rate of Riefler clock as indicated by graphs.

This fond contains correspondences related to clocks in Madras and Kodaikanal Observatory

This is a reply letter from Charles Michie Smith, the Director of Kodaikanal and Madras Observatories to Gilbert T. Walker, the meteorological reporter to the government of India regarding the inadequacy of a single clock and along with the letter is a proposal stating the details about the required clocks for the Madras Observatory.

This is a letter from the Director of Kodaikanal and Madras Observatories to the meteorological reporter to the government of India regarding a new clock for the Madras Observatory. It talks about the type,time and amount required for the making of the clock .

This is a letter from the Director of Kodaikanal and Madras Observatories to the meteorological reporter to the government of India. It requests for the access for the spare drum.

This is a reply letter from Gilbert T. Walker to the Director of Kodaikanal and Madras observatories informing that the drums of the thermograms are not always interchangeable. It further states that he is giving calcutta office instructions regarding sending of the drums.

This is a letter from Gilbert T. Walker to the Director of Kodaikanal and Madras observatories informing that the Richard's daily Thermograph by L.Casella has been forwarded by rail