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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.

This item was a stellar object requires two coordinates to locate it on the sky, as the sky is a two-dimensional plane. One of these coordinates known as declination. This is similar to the two co-ordinates viz. latitude and longitude, defining a point on the surface of the earth. 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 fond contains Results of observations of the fixed stars made with the Meridian Circle at the Government Observatory , Madras

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.

The album includes photographs captured during the installation of the H-alpha telescope at Kodaikanal Observatory in 2014 by an expert team from China. The H-Alpha telescope has a 20 cm doublet objective lens that produces a beam at f/7.9. The telescope creates a full-disk image of the sun using extra optics. The telescope can also be used to magnify a portion of the sun's disc. The album includes all stages of the installation process with the caption and instruments associated with the telescope. Photos of the IIA team with the team who came from China and cultural programme photos are also archived in this album. It was installed during the directorship of P. Sreekumar.

These photographic slides contain photos of Bhavnagar 20-inch Dome, Hydrolic gate from spectroheliograph, etc.

These photographic slides contain photos of North and South domes of Kodaikanal Solar Observatory and buildings

These photographic slides contain photos of the Kodaikanal solar observatory, North and South domes, solar tower and tunnel, changing of dome and old 15'' dome.

These photographic slides contain photos of Magnetic Observatory of Kodaikanal, Magnetic recorder room, Magnetic variometer

These photographic slides contain compressed pictures of astronomical instruments in Kodaikanal, which are named Tunnel & Spectro, Solar Tunnel, 28-inch Mirror Coelostat, Solar image on the shit, Solar image, Tunnel drive, Solar tower 3rd mirror, II mirror Coelostat.