This is a letter from F.W. Pirrie Lieut-colonel to The superintendent of Telegraph Madras regarding the longitude of the point which is used to estimate madras time.

This is a letter from Gilbert T. Walker to the Director of Kodaikanal and Madras observatories informing despatch of drum by post and a request for acknowledgement.

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 reply letter from Gilbert T. Walker to the Director of Solar Physics observatory, Kodaikanal requesting for a special indent for the requests of clocks in the above letter. He also asks for precise details about the required clocks.

This is a letter from Gilbert T. Walker to Charles Michie Smith stating the inadequacy of the single clock at Madras for the time service. This letter asks for a detailed proposal for supplying the deficiency of clocks.

This letter is from Gilbert T. Walker to John Evershed regarding the loan and overhauling of a Chronometer if it is impossible.

This is a letter from Gilbert T. Walker, Meteorological Reporter to the Government of India and Director General of Indian Observatories, to the Director of the Solar Physics Observatory, Kodaikanal, regarding adopting standard time. An official order has yet to be received, so kindly arrange with the Superintendent of the Madras Telegraph Office to send the time signal at 16:00 hours, new standard time, after July 1.

This letter is from Gilbert T. Walker, Meteorological Reporter to the Government of India and Director General of Indian Observatories, to the Director, inquiring whether any notice has been received from Washington regarding a unique series of midnight telegraphic signals to be sent out by the U.S. Naval Observatory on May 3 1905.

This letter is from John Evershed to G. C. Simpson, Director General of Observatories, in reply to D.O. No. 6347 about the visibility of eclipses from India and Mesopotamia in 1920. It was mentioned about the difference between Indian Standard time and Mesopotamian times of the eclipses.

The letter is from John Evershed to Gilbert T. Walker regarding the rates of the Reifler clock. It states that the Reifler clock in Calcutta runs better than that in Madras.