It consists of two parallel parts: the 16 digit accumulator section to the rear, and the 8 digit input section to the front. The input section is mounted on rails, and can be moved parallel to the accumulator with a crank and worm gear on the left end (the crank is removed and lying in the foreground), to align the digits of the operand with different digits of the accumulator. The 16 vertical wheels on the front of accumulator section are the output dials, with numbers 0-9 around their circumference that appear in windows in the top plate. The 8 shiny horizontal disks on the input section in front are the operand dials, with knobs for setting the operand into the machine. The crank on the front performs the calculation.