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Altazimuth theodolite

Altazimuth theodolite, 1731-1766

1731-1766
6 inch transit theodolite by Henry Barrow & Co., c.1850

6 inch transit theodolite by Henry Barrow & Co.

1849-1851
Altazimuth theodolite

Altazimuth theodolite, 1775-1785

1775-1785