Lens

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              20 Archival description results for Lens

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              IND-IIA-F206-I04 · Item · 04-11-1921
              Part of Correspondence related to Nizamiah Observatory during 1917-1923

              This letter was sent to John Evershed regarding the estimates for regrinding and figuring the concave back surface of the 12-inch Hyderabad lens to Mr Hydari, Hyderabad (Deccan). The cost bill should be sent directly to the Director, Nizamiah Observatory, Hyderabad, for payment.

              Walker, Gilbert T.
              IND-IIA-F206-I05 · Item · 24-07-1922
              Part of Correspondence related to Nizamiah Observatory during 1917-1923

              This letter is from John Evershed to Mr Bhaskaran about the instructions to pack the 15-inch lens in a large case. He also mentioned that he had put castor oil between the component lenses to keep them perfectly adjusted and saved about 8 percent of light otherwise lost by reflection.

              Strange, W. L.

              This letter was reply to letter dated Oct. 29 about lenses. He was requesting 15-inch, 12-inch, 4-inch and a lens of about 7 ft. focus lenses to be send from Nizamaiah Observatory to Kodaikanal Road Station mentioning the purposes for which it requires. In addition the item has the telegram messages written by Evershed to Pocock and vice versa.

              Evershed, John