Calculating engine

Calculating engine, specimen piece, with instructions and engraving, 'Difference Engine No1', bronze / steel / wood / paper, designed by Charles Babbage, parts made by Joseph Clements, assembled by Henry Provost Babbage, England, 1822-1879. A calculating engine consisting of six ferrous metal shafts supporting various bronze wheels with engraved numbers, cogs and cams all mounted on a mahogany base.