The fond contain correspondance of M. K. Vainu Bappu with C. V. Raman and mentors, donated by Mrs. Yemuna Bappu to IIA archives.

The letter is from Otto Struve, Berkeley Astronomical Department to Dr. V. Bappu, Mount Wilson and Palomar Observatories asking to discuss with Dr. Merrill about Pleione if possble and also asking if he will be intrested to rad the papers by Dr. S. Miyamoto of Kyoto University.

This letter was about the Azimuth Stars on which the government astronomer did not get any reply for his proposal to observe places.

This item was about the French Father Richaud made the first astronomical discovery on Indian soil. In 1689, when he discovered the double star Alpha Centauri using a 12-foot telescope in Pondicherry. He also determined the latitude and longitude of Pondicherry.

This item was about the investigation conducted by Society, they have found a possible relationship between C V Raman and S Chandrasekhar. According to their findings, S Chandrasekhar, who recently won the Nobel Prize, was a nephew of Sir C V Raman. The investigation also revealed that every member of Sir Raman's family has made some contribution to society in different ways.

The fond contain newspaper clippings on Astronomy: Ionosphere reading of stars. This states that the Indian astrophysicists propose that the Earth's ionosphere disturbances caused by X-ray bursts (XAY BIRT) could signal stellar activity. This alerts astronomers to phenomena like Sc X1's X-ray emissions. Detecting the impact of stars on the ionosphere is challenging due to background interference, with debates on ionization and magnetic field effects. Dr. Sastri and Dr. Murthy's experimental study reveals a significant magnetic field increase during a Sc X1 flare. Understanding the ionosphere's response to X-rays, including gamma rays from catastrophic stellar events, may offer a distinctive detection method for monitoring space events, aiding astronomers in decoding cosmic phenomena efficiently.

This fond consist of newspaper clippings on the discoveries that was made from the indian soil in early 17th century.

The notes contain tabulated values on equations of different stars. The stars are named Star I, star C, and Star J.

The item was related to the observation of stars taken from 1874 to 1887. The observations are tabulated based on the name of the stars, date, and readings.

The Book On the discovery of The Periodic Law and on relations among the atomic weights written by John Alexander Reina Newlands was published in 1884. It has 70 pages.