Collection: Osher Collection
Name: [Scientific and natural phenomenon] Calculation of the longitude of Portland by George Blackburn ; Calculation of the longitude of Mountjoy by Captain Moody.
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Date/Date Range Produced: 1821 - 1831
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Notes: Two oversize sheets of astronomical observations to calculate the longitude of Portland and Mountjoy, Portland, Maine, dated 1821 and 1831.
Physical Description: 2 sheets : ms. ; 43 x 55 cm. and smaller
Accession Number: OS-1819-9.38
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