Premium Collections on Punch Cards [Reply]

The Society is under obligation to Mr. Crawford for giving a more detailed account of the mechanical operation of the "layer cake" card than I felt I had space for in the original paper. Some question may be raised, however, as to his statement that the paper "overlooks the fundamental advantages of this card form". From a careful study of Mr. Crawford's exposition it would seem that his use and application of the "layer cake" card is fundamentally the same as that set forth in the paper. In so far as card form and card punching routine are concerned, except for a few minor details, the two operations are as alike as two peas in a pod.