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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.

The photographic slide contains an image of Rajamohan Irulappan village in Kavalur.

The photographic slides contain images of the 15-inch telescope in Kavalur from 1969 to 1971.

The photographic slides contain images of the 40-inch telescope control desk, it's construction, reparing of it's dew cap from 1971 to 1984.

The photographic slides contain images of the 40-inch telescope, its parts like the plate holder, Cass coude ring, and observer guiding at Cass coude focus.

The photographic slides contain images of the Kavalur building construction, the 40-inch telescope and its nearby places.

The photographic slides contain images of Ritchey Chretien, Raheem and Nadhan at Kavalur, a rite of the first hut, a 16-inch telescope, a 30-inch drive circuit microprocessor, ribbon cutting at STARS(1977 Jan 23), 6-inch telescope, Schimt telescope, etc in Kavalur Observatory.

The album contains photos of the briefing of the National Large Optical Telescope teams held in IIA Bangalore campus in 1993.

The album contains photos of the initial stages of the Kavalur Observatory campus. Photographs of Director M. K. Vainu Bappu's visit to Kavalur for site inspection and selection for the setting up of the observatory building and workshop. Photos from the construction of 40-inch and 90-inch telescopes, images of albuminization of the 40-inch telescope and the instruments of the telescope can be seen in this album.

The album contains photos of the foundation stone laying ceremony by former Director Prof. J. C. Bhattacharyya for the scanner telescope at Kavalur in August 1990. The album includes pictures of the scanner telescope model, 40-inch telescope, Kavalur Observatory, delegates who attended the function, and similar pictures.