The letter was written by E. C. J. Bond who was the officer in-charge No. 18 party (Magnetic), Survey of India to the Director of the Madras and Kodaiknal Observatories, Kodaikanal. He was asking the director to set up the necessary procedures to collect various deflections from the magnetograph in Kodaikanal, including visual and photographic deflections.

The fond contains correspondence between E. C. J. Bond, the officer-in-charge, No. 18 party (Magnetic), Survey of India, and the Director of the Kodaikanal and Madras Observatories during 1919-1920. The official letters are about the magnetic observations from the Kodaikanal Magnetic Observatory. The observations have been taken from the Kodaikanal Observatory and used to send to The Survey of India office for scientific purposes. This fond consists of 7 letters sufficient to understand the cooperation between The Survey of India and The Kodaikanal Observatory.

The letter was written by E. C. J. Bond, the officer in charge No. 18 party (Magnetic), Survey of India, to the Director of the Solar Physics Observatory, Kodaikanal. E. C. J. Bond has mentioned some suggestions to the magnetic observers to get accurate values during the observations. It was written in 1920 in Dehra Dun.

The letter was written by E. C. J. Bond, who was the officer in charge No. 18 party (Magnetic), Survey of India, to the Director of the Madras and Kodaikanal Observatories, Kodaikanal through the Superintendent of the Trigonometrical Survey. This letter lists the dates that the observation result was missing, together with the declination traces, H.F. traces, and V.F. traces. It was written in 1920.

The letter was from Charles P. Butler to the Officer Commanding Royal Engineers informing him that the nearest railway station where recent magnetic declination observations were made is Perambur Station, located 4-5 miles from Fort St. George. He provided the latitude, longitude, and magnetic declination for this location.

This letter is from Colonel St. G.C. Gore to the Meteorological Reporter to the Government of India and Director General of Observatories about the Vertical force Magnetograph, which had been sanctioned for Kodaikanal.

Letter from E. C. J. Bond to the Director of Kodaikanal Observatory about recording the magnetic observations

The letter was written by E. C. J. Bond who was the officer in-charge No. 18 party (Magnetic), Survey of India to the Director of the Madras and Kodaiknal Observatories, Kodaikanal through the Superintendent of the Trignometrical Survey. Through this document, the author was inquiring how the tabulated data in the original and duplicate magnetic forms taken from Kodaikanal and delivered to the Survey of India office differed. Also provided are a few instructions for the observers. Letter was sent from Mussoorie in 1920.

The letter was written by E. C. J. Bond who was the officer in-charge No. 18 party (Magnetic), Survey of India to the Director of the Madras and Kodaiknal Observatories, Kodaikanal. In this letter, he claims to have sent a registered parcel post to Kodaikanal that contained three strips of fine phosphor bronze fibre and four incredibly fine tungsten wires that could be used to suspend the magnetograph's declination. The letter was written in Dehra Dun in 1919.

The letter was written by E. C. J. Bond, the officer in charge No. 18 party (Magnetic), Survey of India, to the Director of the Madras and Kodaikanal Observatories, Kodaikanal, Via the Superintendent of the Trigonometrical Survey. Through this letter, E. C. J. Bond was conveying three suggestions to the magnetic observers to raise the calibre of the observatory magnet.