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.

Fond provides a comprehensive overview of microscopy, covering introductory concepts and various aspects, including lenses and light phenomena. It delves into the construction, theory, and practical use of microscopes. Beginning with a historical perspective, it navigates through the significance of lenses and optics, shedding light on the interplay between light and microscopic observation. Detailed discussions on microscope construction and theoretical foundations are included.

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 letter was written by William Butler, the Director General of Stores to the Director of Kodaikanal and Madras Observatories, Kodaikanal, on the shipping of photographic plates from the Meteorological Department as per the request. The list with the number of materials being delivered is mentioned in the document.

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.

William Butler wrote this letter to the Director of Kodaikanal and Madras Observatories to inform him that the photographic plates were dispatched and there was a new fresh demand for photographic plates.

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 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.

This letter mentions on sending of 13 rolls of bromide paper in a soldered tin case as requested by Prof. Milne.

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.