1To George Washington from Ernst Frederick Gayer (Guyer), 24 April 1793 [letter not found] (Washington Papers)
Letter not found: from Ernst Frederick Gayer (Guyer), c.24 April 1793. Thomas Jefferson wrote Gayer on 26 April: “I have duly received your letter of the 24th inst. inclosing a Memorial to the President on the subject of an instrument and table of your invention for ascertaining the longitude at sea, and desiring that the patent-board might appoint a time for examining into the same” and that...