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Updated: August 12, 2026
It is true that a daguerreotype, taken by Berkowski with the Königsberg heliometer during the eclipse of 1851, is still valuable as a record of the corona of that year; and some subsequent attempts were made to register partial phases of solar occultation, notably by Professor Bartlett at West Point in 1854; but the ground remained practically unbroken until 1860.
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