This letter was about M. K. Vainu Bappu should undertake research on "Photoelectric Photometry of Eclipsing Variables".

This letter was mentioning Sulaiman's excuse and agreeing with his prediction. Further he mentioned about Sulaiman's earlier papers and his "Chapter III".

This letter was a reference to John Evershed letter that discusses regarding the spectral lines

The letter discusses about the report to be prepared by A.Fowler for IAU commission on standard wavelenth and he asks John Evershed for any special suggestions to add in the report.

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.

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 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.

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.

This fond contains official letters related to William Butler from March to November 1908.

This fond contains letters, annual expenditure reports and bills of Kodaikanal and Madras Observatories. It also contains correspondence of John Eliot,Charles Michie Smith and R.E.V.Arbuthnot during July 1901 to March 1903 regarding the index slip, meteorological summaries, seismological reviews and disturbances and other reports like annual expenditure, bills, and telegraphs. It has a report on the condition and proceedings of the government observatory, Colaba, written by N.A.F.Moos. It also has letters from the Royal Society of India, H. Grubb, J. Larmer, R. Fuess, William Butler and Charles P. Butler to the Meteorological Department and Kodaikanal & Madras Observatory.