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

The letter was written by Houghtons Ltd. to The Secretary of State for India in Council on the enquiry about the quality of the spectrograph slides being sent to Kodaikanal Observatory.

The document is a letter from the Director General of Stores to the Director of Kodaikanal and Madras Observatories regarding the poorly maintained photographic plates that were sent to the Kodaikanal Observatory.

The item is a letter from the Director General of Stores to the Director of Kodaikanal and Madras Observatories, enquiring about the sensitivity of the photographic plates supplied to the Kodaikanal and Madras Observatories by the Imperial Dry Plate Company.

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 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

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.

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 fond encompasses materials centred around the achromatic telescope and its diverse mountings. It features detailed figures of the telescope and incorporates a comprehensive catalogue of instruments crafted by Troughton and Simms.

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