| Year | 2009 |
| Date | 04-Dec |
| Volume | 203 |
| Issue | 4,366 |
| Page | 712 |
| Category | Horology |
| Part | |
| Title | A Universal Heliochronometer |
| Author | Michael Lee |
| Notes | Describes his version of Armstead's sunlight compass design. Forgotten design, further developments, constructing a 2008 instrument, using the Heliochronometer, using the instrument as a clock, using the instrument in the Southern Hemisphere, making the instrument, craftsmanship, Charles Wade, design and construction time, acknowledgements, references and notes |