The letter is from the Executive Engineer Madura division to the Superintending Engineer VI circle Trichinopoly. It is regarding the work of the spectroheliograph building, requesting to comply with the indent for iron articles as no further progress can be made without it.

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.

The letter is from the Director, Kodaikanal & Madras Observatories to the Executive Engineer, Madura, mentioning Mr R. Savarinathan, about making a watertight roof and also not signing the estimate as it does not provide for working without interfering in the use of instruments.

The letter was a request for sending copies of all printed forms, instructions, and full particulars of the photographic process in connection with the 8-inch solar photographs done by the Superintendent of Trigonometrical Survey.

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.

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

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.

The letter is from Captain J.O. C. Phelan, Officer in charge of the VI Circle. to The Director of Observatories, Madras and Kodaikanal, forwarding the revised estimate of Rs.3540/- for the reroofing of the spectroheliograph building for his countersignature and transmission to The Director General of observatories for sanction.

The letter is from C. T. Mullinga, Superintending Engineer, Sixth Circle, to The Director of Observatory, Kodaikanal, forwarding an estimate amounting to Rs.545/- for special repairs to the roof of the spectroheliograph building for his countersignature.

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