[N. p., ca. 1786]. Autograph ink on laid paper, 3 x 7.5 inches. Neatly ruled border, calligraphic caption title. Old folds; some light soiling and staining, most especially to the verso; in very good condition. Item #18834
An attractive, neatly-executed tabular handy reference for the years 1787-1799; the list of years keys the day of the week to the date below the month in the table columns, i.e., the key day on 1798 is Thursday, and under the column for June one finds the 7th, 14th, 21st, and 28th—all of which fall on a Thursday in 1787. (The user could presumably extrapolate from there to calculate the day of the week for other dates.) Also includes a system for calculating days on Leap Year.