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

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 was an enquiry with reference to the Photoheliograph which was received on loan from Greenwich Observatory, whether to return it or it may be completely dismantled and the parts used for other purposes in our research work.

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

The item is letter from the Meteorological Department to the Director of Kodaikanal & Madras Observatories, containing a copy of letter No.1286 from the Meteorological Reporter to the Government of India and Director General of Indian Observatories to the Director General of Stores, acknowledging Letter No.937 dated 19 Jan 1905 and saying that the Director of Kodaikanal Observatory is unable to send the details of the plates for the spectroheliograph until he has experimented with the plates, the information will be send as soon as it is available.

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.