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The item is a 6 inch transit circle. The transit circle is an instrument used to determine the declination of stellar onjects. It consists of a circular scale kept perpendicular to the rotating axis of a telescope tube.

The item contains six telegraphs from the Telegraph Director in Bombay, with four directed towards Kodaikanal and two towards Chetput(Chennai). One is a request for a copy of the magnetogram taken during the magnetic storm.

This item was a optical instrument named as Stereoscope. Stereoscopes are apparently those optical devices that help to view the two images separately and with relaxed eyes. There are two types of stereoscopes as: lens or pocket stereoscopes and mirror stereoscopes. Lens or pocket stereoscopes are great for viewing the whole overlap area of prints up to 9 cm × 13 cm or parts of larger patterns. On the other hand, mirror stereoscopes were designed to accept standard 23 cm × 23 cm metric air photos and work well with A4/US letter-sized prints. Most models come with magnifying options up to eight times, which is pretty impressive. One cool thing about mirror stereoscopes is that they are large enough to allow the analyst to draw beneath them, so it is possible to trace objects identified in the stereoview with a pen onto one of the images or a transparent overlay. However, it's important to remember that this sketch wouldn't have the geometric properties of a map as it contains all distortions present in the base image.

This letter was from the Director of Kodaikanal & Madras Observatory informing about the erection of new buildings for Poona instruments and outside painting of Observatory Domes, the Spectroheliograph building and the magnetic observatory.

This fonds contains photographic slides from a space science seminar in 1965. An image of S.S. Kumar and Zwestha, an image of Shelton Clock, and a few other images were also there.

This item was about the page from M.S. Records stating that the Madras Observatory was established in 1786. The Madras Observatory was first was established in 1786.

This item was about the photograph of painting of Madras Observatory in 1792. It is considered as a postcard.

The item contains data on North declination and South declination corrections from 1874 to 1881 taken from Madras Observatory.

The item contains observation notes on the great comet in 1861, July 3, and the minor planet Asia taken on April and May of 1961. Below the observation, specific details regarding the comet tails were noted.

The document contains observation notes about the meantime of planets from 1865 to 1868.