Improvements in Instruments for Computing Wages and Analogous Calculations.

摘要

8910. Roegner, G. April 30. Calculating-apparatus for wages &c. The products of pairs of numbers which are marked along containing-sides G, H of a rectangular plate E are exposed at apertures e in the plate by shifting pairs of slides C, D in grooves B', B2 at rightangles in a bed-plate B, the lower slide C being marked with the products, and the upper ones D being pierced with apertures d.