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The fonds contain circulars and letters from the Meteorological Department, Government of India.

The fond contains correspondence related to the Periyakulam Observatory.

This Fond is related to Magnetic Observatory of Kodaikanal

The fond contain correspondence regarding the proposal to build a General Hospital on the Spur Tank and 'Air blast' in the mines of Mysore.

The fond contain correspondence regarding the Astronomical Observatory at Lahore. The letter is from the Director of Kodaikanal & Madras Observatories to the Registrar, Panjab University, Lahore, giving suggestions for the proposed Astronomical Observatory to be built in Lahore. The letter has suggestions about transit instruments and a 7-inch equatorial telescope. A sketch of the roofing complex is also attached.

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

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

The fond contain compilation of Photographs, Newspaper Clipping, Pamphlets, Correspondence to Chinthamani Ragoonatha Chary and Transit of Venus.

This fond includes a comprehensive catalogue of the main fixed stars compiled at the East India Company's Observatory in Madras.