Sextant by John Allan
Finding your way at sea
This sextant carries the signature of John Allan, a British "optician and mathematical instrument maker" who worked in Baltimore from 1810 to 1819. A guide to navigation, the sextant permitted observation of the moon and its position relative to the fixed stars. Allan guaranteed the accuracy of his sextants: "All Instruments sold by me are graduated by my father's improved self-correcting engine, for which the [British] Society of Arts voted him their Gold Medal, on the 19th of May, 1810."
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