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This item was an instrument used for measuring the intensity of a light source. It uses a light-sensing device that is calibrated to express intensity in a standard unit. Some optical elements such as lens etc. are also employed to incerase the sensitivity of the instrument.

This fond contains the life history and a brief description of the discoveries of Mr.N.R.Pogson.

This fond contains collection of items that provide information about solar eclipses that occurred during the time period of 1868-2006. The collection includes photographs of total solar eclipses that took place on different dates, and covered from different places as well as sketches that help to illustrate the phenomenon and the path of the eclipses.

This fonds consists of photographic slides associated with Ross Laboratory in Secunderabad. One of the images showcases a panoramic view of the Ross Laboratory, while the second image captures the Tableau Memorial dedicated to Ronald Ross.

These photographic slides contain photos of workshops held in Kodaikanal and some instrument photos. Here also, we can find pictures of Peter's workshop on the 30-inch hydraulic slew clinch, Millino machine, Arbudaraj Bandsaw machine, Old Lathe machine, and one photo of Kodaikanal Library and 6-inch North dome.

These photographic slides contain photos of the Kodaikanal Observatory, Domes, Spectro, and Solar tunnel.

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

This fonds encompasses photographic slides showcasing prominent tourist destinations. It features diverse images, including Amherstia nobilis and Brownea coccinea in Lal Bagh, Bangalore, the old falls in Kutralam, Tamil Nadu, a scene of an elephant lifting a log on the roads of Munnar, fishing boats in the Bay of Bengal, and a tea garden in Munnar. Additionally, the collection includes images capturing the Krishnagiri Forts in Tamil Nadu, the Hare Island Lighthouse in Thoothukudi, and a compelling photograph of an elephant working at a logging camp in Thekkady.

This fonds contains images taken from other places, including Krishnagiri Fort, Vellore Fort, Deers in Thekadi, Images of urchins in Tuticorin fishing harbours, and Chinese-style fishing nets in Cochin. There are images of Howrah Bridge, Snow View from Nanda Devi and an image of a fruit market in Singapore.

These photographic slides contain pictures of sightseeing on the way to Leh from Delhi. It contains survey pictures of the West hill of Mt. Nimmu and the base camp of Mt. Nimmu, the Himalayan ranges, and the set-up on the East hill of Mt. Nimmu.