[57] Bridenbaugh op. cit. (footnote 16), p. 63; Frederick W. Hunter, Stiegel Glass (Boston: Houghton Mifflin, 1914), pp. 157-161.
[58] Henry C. Conrad, "Old Delaware Clockmakers," The Historical and Biographical Papers of the Historical Society of Delaware (1897), vol. 3, chap. 20, pp. 4-34.
[59] Edward E. Chandlee, Six Quaker Clockmakers (Philadelphia: Historical Society of Pennsylvania, 1943), pp. 70, 193, 212, 220-223.
[60] "Frederick A. Heisely, Watch and Clockmaker and His Recorded Years, 1759-1839," Timepieces Quarterly (November 1948), vol. 1, no. 1, p. 33.
[61] Hindle, op. cit. (footnote 6), pp. 22, 68.
[62] Gillingham, op. cit. (footnote 19), pp. 293-294.
[63] Ibid., p. 303; Royal Pennsylvania Gazette, April 19, 1778.
[64] Gillingham, op. cit. (footnote 19), p. 302.
[65] Ibid., pp. 305-306.
[66] Eckhardt, op. cit. (footnote 9), p. 195; George Evans, Illustrated History of the United States Mint (Philadelphia: Evans, 1890), p. 114.