This week has been really busy! Apart from painting the forth bridge (the new shop!) It’s been a week of month going clocks. The first is a very rare Grande Sonnerie quarter chiming Biedermeier Vienna clock that last for a whole month on one wind! The case is a standard 4ft case with a 70cm drop for the weights. With clocks of this finesse, the attention to detail for the repairer has to be second to none. The amount of power available on a standard Vienna is small. On a month going clock it is simply minuscule! Every pivot, pinion, bush, wheel tooth and pallet face has to be perfect. Any tiny imperfection and they stop! To add to this, this clock has to perform just under 26000 hammer strikes per wind in 70cm of fall.. As you can imagine. These clocks can be… Tricky to say the least.
The second clock is a stunning late 17th century Month going long case clock by Micheal Bird. Dating from around c1685 this clock is old! As well as being 340 years old, these very early month going long case clocks need just as much attention as the complicated Vienna. The brass is fatigued in places and the tooth form is not always perfect so again, every surface, lever and bearing has to perfect to allow this clock to run on its limited power. As you can see from the pictures.. The weight is quite large.. But not too much bigger than a standard long case weight. When testing these early clocks… I find it useful to test each side first. That way when the clock is together fault finding can be efficient without too many red herrings
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