IND-IIA-F001-I32
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Item
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11-05-1923
Part of Official and personal files of John Evershed with other Directors, famous astronomers and global institutes
The letter points out that the new wire which was inserted in the Photoheliograph on Nov.14, 1922, does not appear to be taut in its frame. The resulting irregularities make the measure of the Zero point a little uncertain.
Evershed, John