1906 · Proportional Lever · Werk 431 von 1.871

A calculating machine with the cover lifted to show a fan of straight steel levers pivoting from a common point, their free ends stepped across a rack, a row of nine setting knobs sliding in straight slots across the front, a scale of the digits 0 to 9 engraved beside each slot, a row of numeral windows below the slots, each window showing the single digit 0, a crank with a turned grip at the right, every other surface plain steel and black enamel, a maker's name across the top reading "Mercedes-euklid", standing on a dark baize-covered table before a deep neutral background, a single raking light from the left raking across the fan of levers.