Front Cover of Wang 720 A/B Standard Trigonometric Program, Circa July, 1971

This is an updated version of the manual for the Wang 720 A/B Standard Trig. Program, published in September, 1970. This updated version contains a number of small changes, and a bug fix to program code of the trig. function package.

This manual was supplied as part of an optional program package that included this manual, a special function labeling strip, and a pre-recorded tape cassette containing programs for performing various trigonometric operations on the 720-A & 720-B calculators. The same package would also operate on the later 720-C.

The manual contains operational instructions for each of the trig. routines, as well as a printed listing of the entire set of programs.

The trig programs package included the following functions: Degrees to Radians, Radians to Degrees, Sin(X), Cos(X), Tan(X), Inverse Sin(X), Inverse Cos(X), Interse Tan(X), Rectangular to Polar, Polar to Rectangular, Hyperbolic Sin(X), Hyperbolic Cos(X), Hyperbolic Tan(X), Inverse Hyperbolic Sin(X), Inverse Hyperbolic Cos(X), Inverse Hyperbolic Tan(X).

Special thanks to Morris(father) and David(son) Greene for donation of this document to the museum. Morris Greene is a retired Consulting Engineer that specialized in structural engineering. Morris purchased a Wang 720-C Advanced Programming Calculator and Wang 701 Output Writer direct from a local Wang sales representative in Silver Springs, Maryland, in May, 1972 (at a cost of $8,800). The calculator was used for performing complex structural engineering calculations required in Morris Greene's successful consulting business.