Edmund Draper (1805–1882) apprenticed with Benjamin Stancliffe in
Philadelphia and worked in partnership with him for a few years. By 1832 he was
in business on his own, making and repairing "Theodolites, Engineer’s
Levels, Surveyor’s Compasses, &c." He also built a dividing engine.
At the time, the only other dividing engine in the United States was that built
by William J. Young, also of Philadelphia. Since Draper never published a
catalog or price list, it is difficult to know how many different instruments he
made, or how much each one cost. He apparently began using serial numbers around
1860, and produced some 28 instruments a year.
Ref: Robert C. Miller, "Benjamin Stancliffe and His Successors: A
Century of Mathematical Instrument Makers in Philadelphia," Rittenhouse
11 (1996): 1–13.