The letter was from Charles P. Butler to John Eliot the Meteorological Reporter to the Government of India and Director General of Indian Observatories, Simla, in 1903. The letter is about increasing the power of the apparatus used for sun-spot spectra of Kodaikanal Observatory.

This letter was reply to letter D.O.No.2492 of 26th March 1923 mentioning that nothing very striking to send you in prominences. He sent copy of one of the best plates and 2 disc plates in K light to show rotation.

This letter was asking a question on results obtained by John Evershed in connection with the displacements of the spectral lines of the Sun towards the red as suggested by Einstein's theory.

This letter was a request of asking one or two original negatives of spectra of the centre and the limb of the Sun.