This letter was about the enclosed list of photographic plates sizes and designations.

The letter is from John Evershed to Messrs Adam Hilger regarding an order for three 60-degree flint prisms of the highest defining quality, two pieces of plane glass highest quality surfaces with one side polished, two pieces of plane parallel blue or green glass of good optical quality transmitting blue light but absorbing violet and ultra-violet. The letter mentions that the bill should be sent to the Director General of Observations in Simla, India.

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.

This Letter is from W. Butler, the Director General of Stores to The Director about the forward of Microphotometer which had been received from Mr. Toepfer

This letter is from J. Evershed to Dr. Gilbert T. Walker regarding sending of the lantern slides. Particulars of lantern plates is attached with this letter

This letter states that the Photomeasuring micrometer is not yet finished and also mentions that they installed a special grinding machine

The letter is from G. C. Simpson, imperial meteorologist, to John Evershed, Director of Kodaikanal and Madras Observatories, regarding 2 micrometres. It states that there were two Hilger bills as there were two micrometers filled with a new screw coating, and only one of the bills has been paid for.

This letter is from the Director of Kodaikanal and Madras Observatories to the Director General of Observatories, Simla regarding the micrometer eyepiece which was rebooked to Madras unopened as desired by the Deputy Director, Madras Observatory

This item was reply to letter S.12098, saying that he forwarded one packet of the Seed Gilt Plates out of which two of the plates exposed and show the defects. It also contains the report of the plates by Evershed, who has worked with the plates. In addition the letter has statement of Kodak Company and the mistake made by the Company.

This letter was about the prints of the spectrum taken on the plates sent by Imperial Dry Plate Company and its relative sensitiveness.