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This fond contains official letters, photographs, and administrative files related to P. R. Chidambara Ayer during the years 1919-1932.

This fond contains official letters related to William Butler from March to November 1908.

This font is regarding public works in Kodaikanal Observatory

This font is regarding Instruments used in Kodaikanal Observatory

This fond contains items related to John Evershed and about his discoveries.

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 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 fond contains letters, annual expenditure reports and bills of Kodaikanal and Madras Observatories. It also contains correspondence of John Eliot,Charles Michie Smith and R.E.V.Arbuthnot during July 1901 to March 1903 regarding the index slip, meteorological summaries, seismological reviews and disturbances and other reports like annual expenditure, bills, and telegraphs. It has a report on the condition and proceedings of the government observatory, Colaba, written by N.A.F.Moos. It also has letters from the Royal Society of India, H. Grubb, J. Larmer, R. Fuess, William Butler and Charles P. Butler to the Meteorological Department and Kodaikanal & Madras Observatory.

The album contains photos of Norman Robert Pogson, an English astronomer who worked in India at the Madras Observatory as a Government astronomer during 1861-1891. He undertook observations of comets and found numerous minor planets. Pictures of his father, wife, and children, as well as old photos of Madras and Kodaikanal Observatory, are archived here. Images of C. R. Ragunathachary, who worked with Norman Robert Pogson, can be seen in this album. Some photos are related to his private observatory, Hartwell House, in England.

The album includes photographs taken of different events held at the Kodaikanal Observatory during the directorship of M. K. Vainu Bappu. The photos belong to the following events

1. Retirement of Poomban
2. Farewell party of Anil Kumar Das in 1960
3. M. K. Vainu. Bappu with the D. G. O. Mr P. R. Krishna Rao and other staff
4. M. K. Vainu. Bappu with Prof. s. Chandrasekhar and staff
5. M. K. Vainu. Bappu with Kodaikanal Observatory staff
6. Visit of Russian scientist to Kodaikanal Observatory
7. Kashiviswanathan with M. K. K. V. Bappu
8. The participants of the electronic class conducted by J. C. Bhattacharyya
9. M. K. Vainu. Bappu with Estimate Committee members
10. Retirement of C. G. Veeraraghavan
11. Retirement of P. Madhavan Nair
12. Retirement of N. Sundharam
13. Felicitation party of M. K.V. Bappu for his Padmabhushan Award
14. 1st Astronomical Society of India meeting
15. 1st Astronomical Society of India meeting