To guide the sailor in his wandering way, See Godfrey's glass reverse the beams of day.

Book VIII. Line 681.

It is less from national vanity than from a regard to truth and a desire of rendering personal justice, that the author wishes to rectify the history of science in the circumstance here alluded to. The instrument known by the name of Hartley's Quadrant, now universally in use and generally attributed to Dr. Hartley, was invented by Thomas Godfrey of Philadelphia. See Jefferson's Notes on Virginia; likewise Miller's Retrospect of the Eighteenth Century, in which the original documents relative to Godfrey's invention are fully detailed.