Mr. Williams at 11 o’clock gave us a philosophical lecture in which he blended two of those he gave last year; upon the centripetal force; and upon the lever.
Wrote a great deal this day. Mrs. Cranch, and Miss Lucy, were here this afternoon.
“4th.,” Founders Online, National Archives, https://founders.archives.gov/documents/Adams/03-02-02-0002-0005-0004. [Original source: The Adams Papers, Diary of John Quincy Adams, vol. 2, March 1786 – December 1788, ed. Robert Taylor J and Marc Friedlaender. Cambridge, MA: Harvard University Press, 1981, p. 215.]