Sextus (Kit)

Plans and kit at http://www.woodentimes.com/
My tribute to John Harrison and his H1
John Harrison was a carpenter, self taught clock maker, born in Foulby Yorkshire and an absolute genius.
I am a carpenter, self taught clock maker, born in Leeds Yorkshire (about 20 km from John Harrisons birthplace) but unfortunately I am most definitely not a genius.

Category:

Science & Technology

Tags:

• John
• Harrison
• wooden
• clock
• H1

[turbo1zz]

You've completely outdone yourself with this one. Absolutely gorgeous! I look forward to being able to build this one. You state on your site you are no genius.... I beg to differ.

[Uhrkunst]

@turbo1zz Imagine being the first to design and build a pendulum clock that could compensate for varying temperatures and the rolling of a ship at sea, and still remain accurate enough to use for navigation, at a time when if you wanted accurate you needed a constant environment, and NO movement!

Now that is genius.

But thank you anyway, I do try my best.

[TheDgoodyear]

I would hardly say that it is a pinch of luck! You are too modest! Your work is impeccable, beautiful, and inspiring! This is a true homage to Harrison! I will also say that your work and the work of Clayton Boyer have inspired me to do my own designs. You can see them at ontimewoodenclocks if your ever browsing. Again, your work is beautiful and I look forward to your next clock.

[Uhrkunst]

@TheDgoodyear Slight blush there! Of course I know your work, I quite often take a look around to see what other people are getting up to, and I have already discovered your site. I particularly like your Remonter, which is an absolute pleasure to watch.

[TheDgoodyear]

Just beautiful. I am amazed that it runs so smoothly. I have typically only seen these double compound pendulum clocks with a weakly coupled spring between the two pendulums. Frictional losses associated with compression and expansion of the spring through tension and relaxation must be much lower than the geared cam assembly that you are using. A spring wouldn't look as elegant! How much mass is contained in the bob? Nice work.

[Uhrkunst]

@TheDgoodyear As to the Bob mass, being a compound pendulum there is the same weight above and below. I know that there are formula to work out the period of a compound pendulum, but they just give me headache. So it is all part experience a pinch of luck and some trial and error.

[Uhrkunst]

@TheDgoodyear Thank you very much Sir. The original had H1 had spring connected pendulums in order to compensate for ship movement, being a nautical chronometer. As the Sextus is hanging on a wall, it obviously does not suffer from the same problem. As to an increase in friction from using a toothed connection, as you know the energy you put into the compression of a spring is always more than you get when the spring decompresses, so I think the power loss would be for both pretty equal.