Mechanical Accountant

"Model B - serial number 11973

The top register is the set-up register. Its purpose is to allow the user to verify the amount that has just been entered - it does not calculate.

The lower register is the result register, and functions exactly as comptometers do.

The 'space' bar at the bottom of the keyboard clears the upper, or 'set-up' register only. The lever on the side of the machine is a clearing lever, which clears both registers. There is no sub-total function.

Each keystroke adds directly into the lower register.
" Jay Goldman.

Courtesy of: Jay Goldman

X-Number World of Calculators