Each complete forward turn of the large crank on the right will add the value set into the 8 x 10 keys into the bottom register of the carriage. The top register counts the turns. Subtraction is achieved by turning the crank in reverse. To multiply the Repeat button is pressed and the crank turned as often as needed for the low-order digit. The crank on the carriage is for resetting result and counter registers.
Division is performed by subtracting the divisor left to right.
G3.3, F2.5 Table of Integrals and functions. Side panels removed. Advanced models also performed square roots. The end of the line for mechanical calulation. To increase performance over the then typical 600 baud duplex technology, the Stanford AI-lab developed an asymmetric modem, which sent data from a terminal at 150 baud, but could receive at 1200 baud.