This letter was a request regarding the present state of knowledge about the periodocity of sun spot activity.

This letter was a reply to the letter discussing definite periodicity in sunspot activity in the mean period being 11.12 years.

Letter from the director of the Geological Survey of India to the director of Kodaikanal Observatory, Evershed asking for the copy of the seismographic records taken at the Madras Observatory taken on 23rd May 1912

This letter is enquiring about the record of a shock of earthquake, slightly affecting Madras on or shortly before 16th March 1911

This letter is about sending a copy of the record of the Seismic disturbances obtained from the seismograph in use at the Alipore Observatory for the half year from 1st January to 30th June 1903 together with photocopies.

This letter informs about the occurance of earthquake on 8th February 1900 at 3 and 3:10a.m.

The document is a letter asking The Meteorological Reporter to send sunlight cards to Kodaikanal and Madras Observatories.

This letter was about the spectroheliograph, observations of widened lines in Sunspot spectra and prominence latitudes and frequencies.

This letter was about sending a copy of the "Preliminary note on Srimangal earthquake of 8th July 1918".

This circular was sent to all local government and administrations to compile and send the difference between Greenwich Mean Time and the Civil Time employed in various parts of India and her dependencies to Professor Milne, The Seismological Investigation Committee of the British Association.