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IND-IIA-F189-I11 · Item · 21-02-1911
Part of Correspondence from Poona and other Observatory

John Evershed, Director of Kodaikanal & Madras Observatory, wrote this letter to Gilbert T. Walker, assuming they might be getting the prism from Poona Observatory. He mentioned sending correspondence about the new micrometer and a specification. He devised another much simpler method of reducing moonlight comparable with 1st magnitude stars, which seems quite successful. He also proposed purchasing a Hartmann machine from private funds to save time and trouble.

Walker, Gilbert T.

This letter was an acknowledgement for sending pump and bell jar. Evershed mentioned about getting the beautiful series of plates of the Spectrum of the iron arc in air and the centre of Sun's disk. He has written about reproduction of prominence photos the sample of work done by the Roorkee Coy., is suitable the screen used being very fine.

Evershed, John