Regulating a gridiron compensation pendulum for a grasshopper clock
Ғылым және технология
For my wooden grasshopper clock built according to the principles of John Harrison (see • Making a wooden grassh... , I'v made a case and a new pendulum. I wouldn't be a Harrison clock without his most famous invention, the gridiron compensation pendulum. I'm also showing a few first measurements of the clock's accuracy and its barometric compensation.
Пікірлер: 6
Loved this description and the clock you made. Thank you for sharing. Likely I am wrong but I thought the over-riding reason the clock loses in denser air is because of increased buoyancy; the pendulum is effectively floating more? Increased air resistance and displacement has a lesser effect? All good to think about!!!
Great work, I love how you’ve laid it out and for easy removal. Are the plans available 🙏👌
@p.hefetrueb2674
7 ай бұрын
Sorry, plans don't even exist. Just heaps of calculations and not-to-scale sketches, but almost all parts were spontanously traced directly on the wood or brass before cutting them out with a jigsaw.
Fascinating, thanks for sharing all this info. I'm curious how you decide which point on the slope of the "hill" curve you want to be? Do you just have to run it with some arbitrary drive weight for a period of time and plot the rate against the air pressure, and adjust drive weight from there?
@p.hefetrueb2674
7 ай бұрын
Exactly, I'm heading towards some patient try and error. The hill test is for determining a range of amplitude where to look.
A clock for the ages…