This is a black and white an unidentified man on the right of the image holding a cord and pushing a button while looking at one of the lighted panels. Text on verso side reads "Picture 21 A close-up of two accumulators showing the operation of addition taking place. The unit on the left is storing the number +1203762893 as indicated by the lighted neons. The next accumulator, which will transmit its number, is storing +3033331112.". Written in pencil on small white round label on original protective sleeve was "1108-9".
