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The fond contain correspondence related to the building, as well as plans and estimates for the sliding roof of the spectroheliograph building.

The letter is about the spectroheliograph building.

The letter is from A. R. deChazal, Executive Engineer, Madura Division to the Superintending Engineer, VI Circle, Trichinopoly returning the estimate of Rs. 1320/- for the re-roofing of Spectroheliograph building.

The letter is from A. Vipin to The Superintending Engineer regarding the issue of funds reduced to Rs. 2500/- while the grant at first was Rs. 5000/-. Asking to provide an extra grant as the materials for roofing have already been brought, and those will deteriorate if kept for long.

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 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.

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 reply on photographic plates for the spectroheliograph.

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 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.