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

The font contains letters, correspondence, life, achievements and participation at National and International level of Dr.M. K. Vainu Bappu

This fond contains materials related to John Evershed that contains general local office materials including letters of all local government and administrations, proceedings, reports to the government of India etc., A large portion of the collection series contains information on observations from various scientists.

This item was about the observations of thirty one variable stars observed by late N.R. Pogson. In this, he had described the different positions and observations with figured illustrations of variable stars.

This fond includes instrumental corrections implemented from 1883 to 1887. Additionally, it features distinct outcomes of observations and average positions of stars during the years 1883 to 1887. Furthermore, the fond contains a distribution list of Madras astronomical publications.

The item comprises observations notes of the opposition of Mars taken from Madras Observatory by N. R.Pogson from September 22 to October 28 of 1862.

The item contains three pieces of information preserved in a single laminated sheet. The first document is a handwritten address slip of sending some objects from Madras Observatory to the collector of north Arcot Chittoor. The second document is an observation note on the moon eclipse on 22 January 1888. The third one is also notes of observation taken in 1960, 1964, 1969, 1972, and 1975 but the other details need to be recognized.

This item was about the observations of great September comet of 1882 made on 11th September 1882. Observed from Madras Observatory by N. R. Pogson.

The item contains data on North declination and South declination corrections from 1874 to 1881 taken from Madras Observatory.

The item contains observation notes on the great comet in 1861, July 3, and the minor planet Asia taken on April and May of 1961. Below the observation, specific details regarding the comet tails were noted.