The letter was mentioning about enclosed letter from the Director of the Kodaikanal Observatory regarding the disposal of the Photoheliograph on loan from Greenwitch Observatory

The letter was a reply to Turner's letter, that discusses on the spectroheliograph observations

Charles P. Butler sent this letter to Gilbert T. Walker on installing a spectroheliograph in the Kodaikanal Observatory. The letter was sent from the Royal College of Science, London, on 3rd June 1904.

The letter is from the Board of Education, South Kensington, to Charles Michie Smith, informing them about the receipt of 78 spectroheliograms of the sun photographs.

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

This letter was about the continuation of the delayed telegram of 30th May 1905. It also contains the recommendation of the observatories committee & relating to spectroheliographic work.

This letter was with reference to his Annual Indent for Stores forwarded in the year 1905 and submitting points towards it. The letter also speaks on photographic plates, lower power microscope and spectroheliograph.

This letter was about the work of repairs to the Spectro Heliograph building, Kodaikanal.

This letter was about spectra for H & K emission and sending a report on the condition of the Zeiss double monochromator.

This letter was about spectroheliograms that Saxenas sent to him. He suggested to improve on this by another factor of 200%. He explains his idea to work on spectroheliogram.