RC (ViW); at head of text: “Thomas Jefferson, Esqr.”; endorsed by TJ as received 14 Jan. and so recorded in SJL. Enclosure: Calender for the Nineteenth Century, published as a broadside in Philadelphia in 1801, being a series of concentric circles engraved by John Draper measuring about four inches in diameter, “shewing the arrangement and the method of finding the Day of the Week or Month in any year from 1800 to 1900, inclusive” (Shaw-Shoemaker description begins Ralph R. Shaw and Richard H. Shoemaker, comps., American Bibliography: A Preliminary Checklist for 1801–1819, New York, 1958–63, 22 vols. description ends , No. 269; Salem Register, 21 Jan. 1802; New-York Evening Post, 1 Feb. 1802).

The writer was probably David Mandeville, who lived at North Sixth Street in Philadelphia in 1801 and 1802 and worked as an “accomptant” and clerk in the Bank of the United States (Stafford, Philadelphia Directory, for 1801, 37; Robinson, Philadelphia Directory for 1802 description begins James Robinson, The Philadelphia Directory, City and County Register, for 1802, Philadelphia, 1801 description ends , 163).