David Rittenhouse was an instrument-maker, astronomer, and treasurer of Pennsylvania. Elected to the American Philosophical Society in 1768, he served as its president from 1791 to 1796.
1 volume, 33 p.
Presented by Mrs. Henry S. Lowber, 1898; accessioned, 1900.
This slender volume contains meteorological and some astronomical data taken at Wilmington, Delaware from July 1 to October 14, 1784. In addition to the data, the volume contains marginalia on the weather, his astronomical clock, and his calculations for finishing the Mason-Dixon Line.