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.

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

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

A memorandum from Public Works Department regarding buildings and roads in Kodaikanal about estimation

This memorandum was written from the superintending Engineer for submitting plans and estimate of Rs 21,300 for constructing quarters for the European Assistant to the Director

This Memorandum no. 1639 is to the Government Astronomer requesting the information about official memorandum no 1610 dated 22nd July 1898 as early as possible.

The book contains the meridian circle reductions taken from the Madras Observatory. The observation table contains the values of North Polar Distance and Right Ascension for the celestial objects in 1862.

The book contains the meridian circle reductions taken from the Madras Observatory. The observation table contains the values of North Polar Distance and Right Ascension for the celestial objects in 1862.

The book contains the meridian circle reductions taken from the Madras Observatory. The observation table contains the values of North Polar Distance and Right Ascension for the celestial objects in 1863

The book contains the meridian circle reductions taken from the Madras Observatory. The observation table contains the values of North Polar Distance and Right Ascension for the celestial objects in 1863