Ewart, J.S.2009-07-282009-07-282009-07-28http://hdl.handle.net/10222/12114One letter , two pages.One letter to James Dinwiddie from J.S. Ewart dated Jan 13, 1789.en1789CompassHorizonArtificialMercuryJ.S. EwartJames DinwiddieW.J. BeleText