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Figure 6.—Astronomical clock made by David Rittenhouse for his observatory at Norristown, Pa., and used by him for the observation of the transit of Venus in 1769. Unembellished pine case 83–½ in. high, 13–¼ in. wide at the waist with a silvered brass dial 10–⅝ in. diameter. Photo courtesy the American Philosophical Society.

Figure 7.—Orrery built by David Rittenhouse for the University of Pennsylvania. The center section shows the motions of the planets and their satellites and the right-hand section the eclipses of the Sun and Moon. The case, considered to be an outstanding example of colonial cabinet-work, was made by John Folwell.

Figure 8.—Brass surveying compass inscribed "Made by Benjamin Rittenhouse, 1787." Photo courtesy Ohio State Museum, Columbus, Ohio.

Figure 9.—Portrait of Andrew Ellicott (1754–1820) by unknown artist.