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

This letter was about the reply on photographic plates for the spectroheliograph.

This item was reply to letter S.12098, saying that he forwarded one packet of the Seed Gilt Plates out of which two of the plates exposed and show the defects. It also contains the report of the plates by Evershed, who has worked with the plates. In addition the letter has statement of Kodak Company and the mistake made by the Company.

This letter was about the Sandell Ordinary Plates special express and the change in the required plates. Evershed's report on the plates sent by Imperial Plate Company.

This letter was about the prints of the spectrum taken on the plates sent by Imperial Dry Plate Company and its relative sensitiveness.

This letter was about the enclosed list of photographic plates sizes and designations.

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 points out that the new wire which was inserted in the Photoheliograph on Nov.14, 1922, does not appear to be taut in its frame. The resulting irregularities make the measure of the Zero point a little uncertain.

This letter was about a drawing of the spectroheliograph that was received at Gilbert T. Walker from the Cambridge Scientific Instrument Company.

This letter was about three volumes of Transit Observations and Mural Circle Observations that had been stored some time at the Indian store depot have recently been presented to the Royal Astronomical Society