This letter was about the performance of the Newton spectrograph, prepatory work and observations on sky.

This letter from Major S.G. Burrard to the Government Astronomer mentioning that Lenox Conyngham is dissatisfied with his Zenith Telescope results and with determinations of the Micrometer value, so he asked for sparing Dehra Zenith sector till next September.

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 letter is from Meteorological Department to the Director of Kodaikanal and Madras Observatories regarding a payment for one spectrum comparing Micrometer supplied to the Kodaikanal Observatory

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

This letter to Dr. Walker informs that the Director will arrange to despatch the necessary fittings for the new screw for the Poona micrometer to Hilger by next mail by next March

Letter to the Director-General of Observatories regarding the specification of a new Micrometer for the Madras Transit Instrument

The document was sent from the Director General of Observatories to Thomas Royds in 1913. The Director General of Observatories inquired about the order of the new screw for the Ponna micrometer in response to John Evershed's letter dated 18th August 1913.

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.