The book An Elementary Treatise on the Integral Calculus by Benjamin Williamson. This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization. It was published in 1884.

The atlas contains maps of different towns and provinces in Southern India in 1854. It has 134 pages.

This letter was about the list of photographs of Sun taken on different dates and at particular times mentioned.

This CD contains a video on the Kodaikanal's beautiful scenario, Kodaikanal Observatory, Telescope, and how the observations happened explained by scientists.

A Treatise on Spherical Astronomy by Robert Stawell Ball was a work on positional or spherical astronomy. It was first published in 1908. It has 506 pages.The book covers various areas of study, including fundamental formulae, determination of coordinates, atmospheric refraction, the theory of cartography, and more. It assumes a good level of geometry and trigonometry knowledge from readers.

A thanksgiving letter to Simpson for the data of a) Black bulb for the year, b) minimum on rass for year, c) sunshine January to April

This is a reply letter to T. Royds stating the length and width of the morse tape required for chronograph

This is a reply letter to the previous one for agreeing to send the Dehra Zenith sector which is not in use so anytime they can send and this also mentioned no need to send a man for packaging

This is a reply letter to the Director from Gilbert Walker with reference to the previous letter. It was mentioned that the sunshine recorder should be firmly fixed so that it will not be accidentally thrown out of adjustment.

This reply letter mentions that the reflected ray is deviated approximately 1 degree when the Nephoscope was rotated