09-039A. EARLY BOUCHER'S POCKET CALCULATOR BY W.F. STANLEY
English, early 1st quarter 20th century, signed on the front face "Boucher's Calculator" and on the back face "Stanley Maker, London." The 2 1/8" diameter body is made of nickel plated brass, with flat beveled glass faces. The front face is movable, with a moveable cursor needle; the rear face is fixed, with a movable cursor needle. The slide rule is in very good working condition, with minor foxing on the front paper face.
09-039B. STANLEY-BOUCHER CALCULATOR BY W.F. STANLEY
English, 1st quarter 20th century, signed on the front face "STANLEY-BOUCHER CALCULATOR PATENT." The 2 1/8" diameter body is made of nickel plated brass, with flat beveled glass faces. The front face is movable, with a moveable cursor needle; the rear face is fixed, with a movable cursor needle and a rotation counter. The slide rule is in very good working condition.
