This fond contains correspondences related to time signals

The fond contains correspondence regarding the water pump and pump house in Kodaikanal.

Correspondence regarding the details of the Specification of turning Lathe

This fond contains letters and documents related to the meteorology in Kodaikanal during 1898 to 1925

The fonds contain letters regarding Madras and Kodaikanal Observatory Grounds.

This font is regarding Instruments used in Kodaikanal Observatory

This fond contains correspondences related to clocks in Madras and Kodaikanal Observatory

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

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.

Seven official letters pertaining to Gilbert T. Walker from 1903 to 1912 are included in the fond. This includes correspondence between Gilbert T. Walker and the Director of the Kodaikanal Observatory and the Meteorological Reporter to the Government of Madras.