In this memorandum the government had under consideration the question of constructing residential quarters for the officers of the Police Department and proposed the portion marked 'D' in the enclosed plan of the Madras Observatory

This Memorandum no. 1619 is for Chief Secretary regarding the letter No. 123 dated 29 June 1898 where what kind of instruments are needed, cost of such instrument etc was asked

This item was a magnetic compass which was used by M.K.Vainu Bappu during the visit to Kavalur for site survey. The magnetic compass is a tool used for determining direction on the surface of the Earth. It operates by using a magnetic pointer that aligns itself with the Earth's magnetic field. This type of compass is the oldest and most commonly used in various forms of transportation such as aircraft, ships, and land vehicles. The Earth's magnetic field acts as an enormous bar magnet with a North-South field that causes freely moving magnets to take on the same orientation. Although the direction of the Earth's magnetic field is not entirely parallel to the North-South axis of the globe, it is close enough to make an uncorrected compass a reasonably good guide. The inaccuracy, known as variation (or declination), varies in magnitude from point to point on Earth.

In this item the Superintending engineer submits a report regarding the progress made on the new observatory buildings in Kodaikanal. It also talks about the special arrangements made by the general superintendent.

This item contains letters from the Colonel. O.V. Boddy Superintending Engineer to the chief Engineer Public works Department regarding a sanction on estimate. It also correspondence a letter from Charles Michie Smith the Director of Kodaikanal and Madras Observatories to the Secretary to the Government of Madras regarding an estimate for the construction of magnetic observatory in Kodaikanal.

This item contains Letters from G.S.T Harris the consulting Architect to Government to the Chief Engineer Public works department regarding the construction of observatory on Doddabetta Peak in the Nilgiris district and the constructions going on in the Kodaikanal Observatory.

This item is from the Deputy Secretary of India, Public works Department to the Secretary to the Government of Madras, Public Works Department regarding a sanction.

This fond is related to prisms from Kodaikanal Observatory

This letter contained with list of the instruments in use in Kodaikanal Observatory

The letter is to Walker referring to D.O. 5934 regarding dark glasses. The letter states that he has never seen the eye-piece box as the wedge was satisfactory.