The fond contains correspondence related to Signaling Time from 1904 to 1923. It has letters from Thomas Royds, Gilbert T. Walker and the Director General of Telegraphs.

This font is regarding public works in Kodaikanal Observatory

This fond contains items related to the telescope purchased by Nawab Zafar Jung of Hyderabad.

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

This fond contains items from the proceedings of the Madras Government

This fond is related to Nizamiah Observatory

The fonds contain correspondence regarding various instruments and their reading in the Kodaikanal Observatory

This correspondence is related to half yearly return of Instruments at the Periyakulam Observatory which were in use on 31st March 1900

The fond contain correspondence of the annual reports of scientific works at Kodaikanal

The fond contain correspondence between the Executive Engineer, Superintending Engineer, Director of Kodaikanal & Madras Observatories, and the Director General of Observatories regarding various constructions and alterations in the Kodaikanal Observatory building.