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Fond provides a comprehensive overview of microscopy, covering introductory concepts and various aspects, including lenses and light phenomena. It delves into the construction, theory, and practical use of microscopes. Beginning with a historical perspective, it navigates through the significance of lenses and optics, shedding light on the interplay between light and microscopic observation. Detailed discussions on microscope construction and theoretical foundations are included.

The fond contains observations of the meridian circle reductions ( refers to the process of correcting the observed zenith distances measured by a meridian circle instrument ) taken from the Madras Observatory from the year 1862 to 1887. Meridian circle reductions refers to a process in astronomy and celestial navigation that involves observations made with a meridian circle instrument.

The fond contains observations of the meridian circle reductions ( refers to the process of correcting the observed zenith distances measured by a meridian circle instrument ) taken from the Madras Observatory from the year 1862 to 1887. Meridian circle reductions refers to a process in astronomy and celestial navigation that involves observations made with a meridian circle instrument.

This fond encompasses a diverse array, including Indian Marine Surveys, Trigonometrical Surveys, the Inaugural Phase of Topographical Surveys, Route Surveys Beyond the Frontier of British India, the Revenue Survey of India, the Geological Survey of India, the Archaeological Survey of India, Astronomical Observations in India, and the Statistical Survey of India.

This fond contains medals and awards received by Dr. M. K. Vainu Bappu

Baldwin and Cradock 47 Paternoster publishes the maps under the Superintendence of the Society for the Diffusion of Useful Knowledge. It contains maps of the Islands of the Atlantic, The Antilles, British Island in the West Indies, the Empire of Japan and City plans of Dublin, Athen, Milan, Madrid, Liverpool, Moscow, Genoa etc.,

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 fond contains observations notes on Madras meridian observations recorded during 1874-1904 from Madrsa Observatory. The observations concern minor planets, stars, equations for the stars i, j, and c, corrections to observed magnetic declination, the Moon and planets, R. Andromeda, Asia, minor planets, and apparent polar distance of stars.

This fond is related to prisms from Kodaikanal Observatory

The title "Les Observatoires Astronomiques" can be translated to Astronomical Observatories. This book consists of astronomical observations from the Royal Observatory of Belgium. It is written by P.Stroobant, E .Delporte, J. Delvosal and F. Moreau, and H. L. Vanderlinden. It is published in 1836