A Simplified Code for Multiple Card Punching
Russell R. Reagh · Journal of the American Statistical Association · 1934
0 Employing this method, the maximum possible combinations of the twelve punch card positions become available so that any number from 1 to 4095 can be punched in a single column of the card. In the writer's opinion, however, coding by this system is a difficult process. A clerk can memorize only a limited number of codes and the use of tables is slow and tedious. By introducing changes which are now proposed much of this difficulty is eliminated. A possible disadvantage lies in the fact that the range of numbers which can be punched is reduced, extending from 1 to 1499. With the improvements now proposed the twelve punch card positions are used to represent numbers as follows: