...) made great improvements in armillary spheres,quadrants, sextants, and large celestial globes... 
George Forbes 「History of Astronomy」
...The want of money alone preventedhim from realizing his wishes; and it was in the hope of attaining themeans of travelling, that he in a great measure forsook his sextants forhis crucibles...
David Brewster 「The Martyrs of Science, or, The lives of Galileo, Tycho Brahe, and Kepler」
...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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