This letter is regarding Calcutta, who had forwarded to Simla a set of sunshine cards received from Kodaikanal. In this letter, it was asked about the explanation of the unsatisfactory marking

This is a letter to the Chief Secretary to the soul of Madras to bring a notice about construction of astronomical telescopes entirely by indigenous labour

This is Reply letter to the Director General of Observatories from John Evershed stating the instrumental co