

| John Harrison 1693-1776 Holding a watch he commissioned John Jefferys to make in 1753 (while he was building H3) which proved the benefit of small, high energy balance wheels. |
| John Harrison's H4 The Clock that changed the world. |




| The Royal Observatory Greenwich in 1700's |
| Harrison's H3 |
| Harrison's H2 |
| Harrison's H1 |
| LONGITUDE Produced by A&E |
| WATCH: THE STORY OF JOHN HARRISON AND THE LONGITUDE PRIZE |
| WATCH: THE DEVELOPMENT OF CLOCKS IN THE EIGHTEENTH CENTURY |
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