Trigonometry.
Simpson, Thomas. 1710-1761.
Trigonometry, plane and spherical; with the con- struction and application of logarithms. 5th edition. ° London: F. Wingrave. 1799. 79 pp. Diagrams. 8 .
No. 2 in **E,197.8
Same. With an appendix on spherical projections. Phila.: Kimber and Conrad. 1810. 125 pp. 7 folded plates. 12°, 7939.9