| Year | 2009 |
| Date | 13-Mar |
| Volume | 202 |
| Issue | 4,347 |
| Page | 342 |
| Category | Horology |
| Part | |
| Title | Tide Clock |
| Author | Roger Castle-Smith |
| Notes | Lord Kelvin's tide-predicting machine, main tidal influences, other tidal influences, harmonic components, machine by William Ferrel, early developments, practical considerations, displaying the information, timekeeping, references |