This letter was to inform that C. V. Raman was greatly obliged for M. K. Vainu Bappu's letter of the 8th July 1954. He got one of the Bausch and Lomb catalogues and was very favourably impressed by it and intend to go ahead and purchase one or more of these gratings for his work.

The letter is from C. V. Ramam, Raman Research Institute to M. K. Vainu Bappu, Nizamiah Observatory acknowledging his letter on 26 March 1954 and saying he has a suitable location for solar physics observatory on the institution grounds. The letter also ask to let know presen address of Zeiss and Cox.

The letter is from C. V. Ramam, Raman Research Institute to M. K. Vainu Bappu, Nizamiah Observatory asking about using telescope mirrors made of cast aluminium and about diffraction grating as a preliminary to building solar observatory.

This letter was asking question on using telescope mirrors made of cast aluminium or other light metal, which could be cheap and easy to make and also what kind and size of grating, its makers and price to building a solar observatory.

The letter is from M. K. Vainu Bappu, Nizamiah Obsevatory to Prof. Raman telling that it is best to plan on acquiring equipment specifically for research on the sun. Adding that the sun plays important role in our general understanding of Astrophysics.