16. Astronomical Observations made at Philadelphia: viz. of a Lunar Eclipse, on the 2d of November, 1789; of the Transit of Mercury over the Sun’s disk, on the 5th of November, 1789; of an Eclipse of the Moon, on the 22d of October, 1790; of an Eclipse of the Sun, on the 6th of November, 1790; and of an Annular Eclipse of the Sun, on the 3d of April, 1791:[[330]] with an Account of corresponding Observations of the two first of these Phænomena, made at the University of William and Mary in Virginia, by the Rev. Dr. Madison; and of the second, alone, made at Washington-College in Maryland, by the Rev. Dr. Smith: communicated by D. Rittenhouse. Read, February 4. 1791.
17. A Letter from Dr. Rittenhouse to Mr. Patterson, relative to a Method of finding the Sum of the several Powers of the Sines, &c. Read, May 18. 1792.
18. An Account of a Comet, (first observed by Mr. Rittenhouse, on the 11th of January, 1793:) in a letter from D. Rittenhouse to Mr. Patterson.[[331]] Read, February 15. 1793.
The fourth volume, printed in the year 1799, (three years after Dr. Rittenhouse’s death,) contains—
19. A paper, “On the Improvement of Time-keepers;” by David Rittenhouse, LL. D. Pres. Am. Philos. Society. Read, November 7. 1794.[[332]]
20. A paper, “On the Expansion of Wood by Heat;” in a letter from David Rittenhouse, LL. D. Pres. Am. Philos. Society. Dated, May 15. 1795.
21. A Method of raising the common Logarithm of any number immediately; by D. Rittenhouse, LL. D. Pres. Am. Philos. Society. Read, August 12. 1795.
22. A communication, “On the Mode of determining the true Place of a Planet, in an eliptical Orbit, directly from the mean Anomaly by Converging Series;” by David Rittenhouse, Pres. Am. Phil. Society. Read, February 5. 1796.
This last communication was made to the Society, within five months of the time immediately preceding Dr. Rittenhouse’s death.