Thanks for the basics. Love those watches with 1Hz Movements! Balance wheel big as the case back.

Very interesting video Bill. I really enjoy when you explain the in depth workings of various movements. You have a wonderful ability of putting things into layman’s terms. Hope your doing a live stream later.

Bill, you dont get enough credit for your presentation. I appreciate the split screen view to see what you're talking about. Merry, Merry ~~~

I think another reason why bigger inertia balance wheel not used much is Newtons 1st law (I dont like terms that much, but somwtimes makes easier the things to tell) that an object will want to remain same. Imagine you rotate (and accelerate) the watch in 1 direction (imagine you're looking at the dial, and you rotate the watch in clockwise direction with acceleration), while the small/lighter balance wheel would be easier to keep aligned with the watch, bigger/heavier balance wheel wouldn't be as easier as the lightweight/small one and would take longer time for heavier one to get its balance.

Strong work Bill!😁

Just stumbled across this video, and I really like it man, it's really educational and it's touching subject that is very complicated and interesting. Thanks Bill, cheers!

Great topic. I will need to do more research.

I was trying to refresh my memory about this topic and I realized the mathematics of harmonic oscillators is advanced....anglular frequency, phase shift, amplitude, period, dampig... that's not your daily stuff unless you work in this field.

nice looking movement in the picture.

I too noticed that getting into this topic is hard because of the fact that it is hard to define what it means to have a good oscillator on a wristwatch. There is the physical term of quality factor which gives proper answers leaving aside outside disturbances. Once you bring in shocks and such, it becomes a complex problem.

What give the initial pulsion to the balance wheel ? Is it the movements of the wrist ?

Very informative. Besides exeptional horology or the higher end brands are there any strong or standard horology brands using large balance wheels? Or as some have comented how do you avoid the slow sweeping seconds problem that most of us try to steer clear of?

For time itself, it probably is irrelevant, as long as the quality & setting precision has been done well. However, for a chronograph, the lower frequency will reduce granularity and how accurately you can measure. Good topic, Bill. Thanks.

At 11:25, 21,6k vph is 3Hz not 26,6k no?

Bill, Is there a relationship between the VPH and the sweep of the seconds hand? Watch Geek has a video titled: "Watch Beat Rates Compared"

Regarding tightrope walkers: www.scienceabc.com/eyeopeners/why-tightrope-walkers-carry-a-polebar-during-their-performance.html

Thanks for the video. Not exactly accurate, but at least somebody is not advocating the higher beats...

Throwing Kari Voutilainen at the beginning of the video is not good for the heart of feeble viewers. Loved the video though!