These photogrphic slides contain IR Photometer of Leh

The letter was written by William Butler, the Director General of Stores to the Director of Kodaikanal and Madras Observatories, Kodaikanal, on the shipping of photographic plates from the Meteorological Department as per the request. The list with the number of materials being delivered is mentioned in the document.

William Butler wrote this letter to the Director of Kodaikanal and Madras Observatories to inform him that the photographic plates were dispatched and there was a new fresh demand for photographic plates.

This letter was about the reproduction of Photoheliograms the Swan Electric Engraving Co. of London.

This letter was about the questions answerd by C. M. Smith on enlarging the camera, sending Lockyer and Evershed's coming.

This letter was about the BARC image convention and the M. K. Vainu Bappu's visit.