This item is a group photo of employees in the Kodaikanal Observatory in 1913.

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

This item was about the photograph of Thomas Royds. Thomas Royds (1923-1937) succeeded John Evershed as the Kodaikanal Observatory Director in 1923 and retired in 1937.

This item concerns about the rare white light flare recorded in hydrogen alpha at Kodaikanal Observatory. These observations were taken on photographic films or plates and digitized for scientific research purposes.

The item is a group photo of Dr. Anil Kumar Das, Prof. K. R. Ramanathan, and other employees of the Kodaikanal Observatory with astronomer Royal from Kodaikanal Observatory in 1947. K. R. Ramanathan was an Indian physicist and meteorologist. He was the first Director of the Physical Research Laboratory, Ahmedabad.

The item is related to the visit of Prof. Sydney Chapman to the Kodaikanal Solar Physics Observatory on 1948 December 31. Sydney Chapman was a British mathematician and geophysicist who contributed to the kinetic theory of gases, solar-terrestrial physics, and the Earth's ozone layer. The photo shows Prof. Chapman and Dr. Anil Kumar Das, the observatory's director, sitting with the other staff. The visit of Prof. Chapman was a noteworthy feature of that year.

The item is a group photo of the staff of the Kodaikanal Observatory on the occasion of Mr.Krishnaswami Pillai's retirement during Dr. Anil Kumar Das's directorship.

The item has two photographs captured during the Directors' conference at Kodaikanal held on 1st January 1953. The first is showing the directors who participated in the conference. The second photo shows the directors and observatory staff.

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

This item was about the Sunspot spectra taken by John Evershed, where he discovered that there is a radial outflow of gases in a sunspot. This effect is now known as the "Evershed Effect".