Chapters
| PAGE | |
| Foreword | [ 1] |
| Types of Ancient and Modern Machines | [ 5] |
| The Early Key-Driven Art | [17] |
| The Key-Driven Calculator | [50] |
| Early Efforts in the Recording Machine Art | [79] |
| First Practical Recorders | [111] |
| Introduction of the Modern Accounting Machine | [144] |
| The High-Speed Calculator | [149] |
| The Improved Recorder | [163] |
| The Bookkeeping and Billing Machine | [174] |
| A Closing Word | [190] |