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

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

This fond contains medals and awards received by Dr. M. K. Vainu Bappu

The fond contain compilation of Pogson's observations and drawing

This fond contains items related to John Evershed and about his discoveries.

The fond contain compliation of Photographs, Newspaper Clippings and Correspondence to M.K. Vainu Bappu and Institutes

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 Scientific Memories selection from the transactions of foreign and academics of science and learned societies is a collection taken from foreign journals and edited by Richard Taylor. The fifth volume was published in 1852

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.

The album contains photos of Norman Robert Pogson, an English astronomer who worked in India at the Madras Observatory as a Government astronomer during 1861-1891. He undertook observations of comets and found numerous minor planets. Pictures of his father, wife, and children, as well as old photos of Madras and Kodaikanal Observatory, are archived here. Images of C. R. Ragunathachary, who worked with Norman Robert Pogson, can be seen in this album. Some photos are related to his private observatory, Hartwell House, in England.