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 photograph of A. A. Narayana Ayyar was taken in 1913 at Solar Physics Observatory, Kodaikanal.

This item is a photograph of P. R. Chidambara Ayer. The date and other information need to be identified.

This item was about the Norman Robert Pogson in 1861. N.R. Pogson was appointed the government astronomer at Madras, India. When he arrived he had to work under harsh conditions. He found the instruments in a bad shape and there were no proper staff to assist him. In spite of all these he began a series of observations which terminated with his death 30 year later. He as credited with 50,000 observations most of which were published by Michie Smith after Pogsons death. During his stay in Madras he discoverd several minor planets and detected large number of variable stars. He named his daughters after the minor planets he discovered. He was also well known for his work in comets and solar eclipses.

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 photographic plates of Halley's comet in 1986 viewed from Kodaikanal under various atmospheric conditions

This photographic slide was on the R. A. Building of the Kodaikanal Observatory.

These photographic slides contain compressed pictures of astronomical instruments in Kodaikanal, which are named Tunnel & Spectro, Solar Tunnel, 28-inch Mirror Coelostat, Solar image on the shit, Solar image, Tunnel drive, Solar tower 3rd mirror, II mirror Coelostat.

This fonds contains photographic slides of book visit at Kodaikanal in the year 1961

These photographic slides contain photos of Magnetic Observatory of Kodaikanal, Magnetic recorder room, Magnetic variometer