A letter from the Director to the Director General of Observatories stating that the cheaper of the two classes of wedges offered by Hilger is quite good enough for the purpose for which they were required

This letter is from W. G. Butler to the Director General of Observatories enquiring the details of the focal length, etc of a single lens, 4" aperture for Kodaikanal Observatory

The letter was written by Houghtons Ltd. to The Secretary of State for India in Council on the enquiry about the quality of the spectrograph slides being sent to Kodaikanal Observatory.

This letter is about photo-visual lens and lens for spectroheliograph for observation in Kashmir

This letter is an extract from U.O. to the government of India, Meteorological Department, on 11th November 1911 regarding dismantling the telescopes and their packing for transit from Poona observatory to Kodaikanal and Madras Observatories by the then Director J. Evershed. In this letter, it was mentioned that the telescopes should be handled with great care, and it was also said that J. Evershed or his deputy should control the packaging by visiting Poona. John Evershed also replied, agreeing with this letter.

This letter is regarding Calcutta, who had forwarded to Simla a set of sunshine cards received from Kodaikanal. In this letter, it was asked about the explanation of the unsatisfactory marking

The letter is to Charles Michie Smith from the Nawab informing that all the arrangements will be made possible for his reception and to let them know a few days in advance of his arrival at Hyderabad.

This is a letter to Mr Bhaskaran from John Ebvershed about the receipt of the 12-inch lens after figuring out the back surface of the cookie, which was tested and seemed entirely satisfactory.

This letter to Mr McDowell states Dr Pfund is now ruling gratings up to 4.5 in, and his diamond points do not last much longer than that. Hence, they are searching for others to rule out some big gratings from the beginning of next month. And this letter was copied to the Director General of Stores to do something needful about this problem, and they mentioned in their last reply letter due to some problem it was impossible to give delivery on time, but everything under their power was done, however, to furnish the grating and the first 6-inch plane ruled of first quality would be shipped.

Letter to Shackleton to reorder a meniscus lens