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The letter is a reply to letter no. 2741 E stated that the pump house is only 6' * 6' and doesn't have space for a belt drive, suggesting a rotary pump for the motor drive. The second sheet is the plan of the motor house.

The letter is about the spectroheliograph building.

This letter is about receiving two dark glasses which are not fit for eyepieces because it was too large

The title "Les Observatoires Astronomiques" can be translated to Astronomical Observatories. This book consists of astronomical observations from the Royal Observatory of Belgium. It is written by P.Stroobant, E .Delporte, J. Delvosal and F. Moreau, and H. L. Vanderlinden. It is published in 1836

This fond includes astronomical observations supplement, and the content was in French language.

The cassette contains lectures delivered by Prof. S. Ganesh (PRL), Prof. D. Bhattacharya (RRI) and R. Srianand (IUCAA)

The cassette contains lectures delivered by Prof. D. Narasimha (TIFR) and Prof. R. Cowsik

The cassette contains lectures delivered by Prof. C. Sivaram, Prof. B. N. Dwivedi and Prof. Ram Sagar

The cassette contains lecture delivered by Peter A. Wehinger, Steward Observatory, University of Arizona, and Dr. Steven V. W. Beckwith, Space Telescope Science Institute

This CD contains 6 videos of lectures given by Prof. C.N.R. Rao on the Founder's Day of IIA, on 11th August 2008 at the IIA Bangalore campus.