| CHAP. | PAGE |
| I. | On Locks and Lock-literature | 1 |
| II. | Ancient Locks: Grecian, Roman, Egyptian | 8 |
| III. | Lock classification. The Puzzle-Lock and the Dial-Lock | 16 |
| IV. | Warded Locks, with their varied appendages | 27 |
| V. | On Tumbler or Lever Locks | 43 |
| VI. | The Bramah Lock | 64 |
| VII. | American Locks | 82 |
| VIII. | The Lock Controversy: previous to the date of the Great Exhibition | 102 |
| IX. | The Lock Controversy: during and since the time of the Great Exhibition | 115 |
| X. | Effects of the Great Exhibition of 1851 in improving English Locks | 140 |
| XI. | The Lock and Key Manufacture | 154 |
| XII. | English Patents for Locks. Aubin’s Lock Trophy. Conclusion | 164 |
| Appendix. |
| XIII. | On an Improved Construction of Lock and Key: Fenby’s Adytic Lock | 176 |
| XIV. | Fenby’s Stop Lock | 193 |
| XV. | Note upon Iron Safes | 201 |
