...) made great improvements in armillary spheres,quadrants, sextants, and large celestial globes...
George Forbes 「History of Astronomy」
...The instruments used in taking the distances, were a nine-inch sextant by Ramsden, and three sextants of eight inches radius by Troughton, the latter being made in 1801, expressly for the voyage...
Matthew Flinders 「A Voyage to Terra Australis」
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