This fond contains official letters, photographs, and administrative files related to P. R. Chidambara Ayer during the years 1919-1932.

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

This letter was about Kavalur observatory from its genesis to its commencement in 1972. its achievements throughout the whole journey.

This letter was about Kodaikanal Observatory's position & surroundings and also talks about scientific celebrities contribution and visits of Dr. Homi Bhabha, Dr. S. Chandrasekhar.

This is the last pay certificate for K.V. Sivarama, 1st assistant at the Kodaikanal Observatory.

This letter was about the request of the government astronomer to arrange the six rain-gauges for use in the North Arcot district.

The proceeding holds information of the Board of Revenue Settlement, R.NO. 608, on the paper of the letter from C.H. Mounsey to report of the earthquake that was felt at night 3-9 a.m.

This proceedings was concerns about the photographs of an eclipse and the communication between Meteorological reporter to the government of India.

This is a proposal letter from the revenue department of the Government of Madras regarding the adoption of standard time in India. The proposal discusses fixing an Indian Standard Time for all Indian railways and telegraphs. It will be precisely 5.30 hours ahead of Greenwich Mean Time and 9 minutes ahead of Madras Time. Additionally, the proposal suggests fixing a Burma Standard Time for use on all railways and telegraphs in Burma, which will be precisely 6.30 hours ahead of Greenwich Mean Time and 5 minutes ahead of Rangoon time.

This fond contains correspondences related to queries sent to Kodaikanal Observatory.