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This letter was about spectra for H & K emission and sending a report on the condition of the Zeiss double monochromator.

This letter was about the Tungston Arc Lamp with power supply is being sent through A.Manickam, as instructed by director. He was seeking acknowledgement for the same to make necessary entries in the stock book.

The video contains an interview of Subrahmanyan Chandrasekhar. Where the interviewer begins admiring the journey and contribution of Subrahmanyan Chandrasekhar and his intellectual. He also spoke about the books written by Subrahmanyan Chandrasekhar and their impact on the world in the scientific field.

The CD contains photos of the ceremony of J. C Bhattacharya's 1.3 meter telescope. It also contains photos of various eminent persons' speeches etc.

Thomas Royds wrote this letter to inform the Director General of Observatories that he had joined as the Director of Kodaikanal and Madras Observatories on August 3, 1913. It was sent from Kodaikanal in 1913.

The book is a collection of memoirs on the various modes according to which the nations of southern parts of India divide time written by Lieutenant Colonel John Warren in 1825.

This letter was about the speech given by Dr. Bappu at IAU-2nd Asian Pacific meeting in Astronomy, Bundurg, Indonesia, August 25-29, 1981. He appreciated the progress of Indonesia in astronomy and its interest to do more.

The cassette contains lecture delivered by Prof. Arun Mangalam

The cassette contains a 10 minutes lecture delivered by Prof. Sreekantan

This letter was about an elaborative lecture given by M. K. Vainu Bappu on scientific development in India and the contribution of India's eminent personalities. The role of astronomy and the key areas that astronomical celebrities have contributed to in India and the World.