pinwheel regulator, huygens winding, ellicott pendulum

bruce linde

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it took four and half months to get this from a dealer in switzerland... here's the blurb on the clock from him:

REGULATOR, ELLICOTT TYPE PENDULUM
Masterpiece, prob. Germany or Belgium, 19th cent.

Precision regulator, glass enclosed on three sides, enamel flat dial with radial Roman numeral hours and Arabic numeral second indicator on its upper part, fine blued steel hands. Circa 1850 with an Ellicott temperature compensated bimetallic pendulum. John Ellicott (1706-1772) was a man of science, watchmaker of King George III, he was one of the most brilliant British watchmakers of the 18th century. This temperature compensated pendulum is made of a bimetallic rod linked to the bob through a levers system intended to compensate for the effect of thermal fluctuations on the precision of the timepiece.

Movement: Very interesting "Baguette" type weight driven brass movement. Graham escapement, pallets of the anchor with inlaid stones.

DIMENSIONS
Overall height: 140cm (55")
Width 43cm (17")
Depth 23cm (9")

A brass plaque is engraved H. Rosselet on the front and inscribed "Jean Prodhom à son ami Hri - Hte Rosselet" on the back. Both were respected watchmakers in Geneva in the later 1800s. In 1887, Henri-Hyppolite Rosselet joined his brother-in-law Georges-Lucien Eberhard when the latter moved to La Chaux-de-Fonds to start his first comptoir, in Avenue Léopold Robert, at number 16. The company changed its name to Eberhard & Cie in 1892, moving to an impressive building in La Chaux-de-Fonds in 1907.



a couple of points worth mentioning:

- the cord was acquired from a sailing shop, who braided the ends together :)

- like a precision regulator, the hour and minute hands are independent and adjusted separately

- the bob rests on the two pins that connect to the ellicott pendulum rod... which means the bob can be lifted off those little fingers for easy removal

- 30 day movement

- love that the pinwheel verge pallets are jeweled :)


main.jpg











movement_pieces.jpg suspension.jpg dial_hands.jpg ellicoott_bob.jpg regulating_knob.jpg christian_servicing.jpeg plaque_front.jpg plaque_back.jpg hanging.jpg
 
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DeanT

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Well Bruce...can't add to any information regarding your clock as it outside my collecting field. But I can tell looking at the movement that its an extremely high quality clock with the sorts of bells and whistles you only find on top end precision clocks. Nice one. Well done.
 
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Ralph

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Bruce, congratulations on your latest acquisition. You’re really amassing a fine collection.

Ralph
 

PatH

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Wow!!!! Definitely a thing of beauty and an amazing piece of workmanship. I notice that the rope appears to be dark in the after-service videos. Did you retain the one that came with the clock? What is on it now?

Re Ellicott's pendulum - you might find this article from the April 1991 Bulletin interesting. There are other Bulletin articles about Ellicott if anyone is interested in learning more.
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bruce linde

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The cord that was on it when I bought it was nothing much… The dealer suggested a new cord and offered me my choice of white, gray, or the black and gray that I chose because it fades into the background
 
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WIngraham

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Beautiful, that is a clock's clock. Well worth a 4 month wait, thanks for sharing. It has more amplitude than I was expecting. Always nice to see lots of good pics and videos, looks like jewelry.
 
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bruce linde

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Beautiful, that is a clock's clock. Well worth a 4 month wait, thanks for sharing. It has more amplitude than I was expecting. Always nice to see lots of good pics and videos, looks like jewelry.

your email reminded me to weigh the bob: 19 lbs 1.3 oz... and that's without the rod assembly. :)
 
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bruce linde

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Re Ellicott's pendulum - you might find this article from the April 1991 Bulletin interesting. There are other Bulletin articles about Ellicott if anyone is interested in learning more.
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great article... thx!
 
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TJ Cornish

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Wow - what an amazing piece! How is the temperature compensation adjusted? My French Astro regulator has a 3 part rod like yours, but it’s reversed - brass on the outside and steel inside. The way yours compensates at the bottom makes sense to me (other than how you tune the compensation), whereas mine is very odd, and of dubious usefulness anyway, as my clock has a mercury pendulum.
 

bruce linde

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according to the article PatH referenced above, the original Ellicott design was more like mine... iron bars on the outside, brass rod center. i don't think the outer bars on mine are iron. :)

the amount of compensation is tuned via the horizontal threaded silver adjusters that sit in the slots in the arms that raise or lower with the center brass rod.... note that they are threaded, with a raised area on the inside that actually contacts the levers.... moving the contact points in and out would adjust the amount of lift or lower.

compensation_adjust.jpg

that said, i will probably leave things as they are. my goal is to get it as perfectly regulated as possible and then see how it does over time.

also... forgot to mention that there are raised rails on the front edges of the inside left/top/right of the case that fit snugly into matching recesses in the door to keep out dust. :)

door_seal.jpg
 

Jevan

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I have no access to the link previously posted by PatH so this may well be duplicate information.

A free to download Royal Society 1752 published John Ellicott article (Philosophical Transactions1683-1775)
A Description of Two Methods, by Which the Irregularity of the Motion of a Clock, Arising from the Influence of Heat and Cold upon the Rod of the Pendulum, May be Prevented; By John Ellicott, F. R. S. on JSTOR

It is also worth searching the site for other innovative makers.


For comparison to the adjustment on Bruce's bob here is an Ellicott Transit Regulator pendulum.

1.JPG 2.JPG 3.JPG 4.JPG
 

Kevin W.

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Thats a beautiful clock, a once in a life time find perhaps. I kow i am not the only one envious of your newest clock find. Thanks so much for sharing too.
 

bruce linde

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Thats a beautiful clock, a once in a life time find perhaps. I kow i am not the only one envious of your newest clock find. Thanks so much for sharing too.

my pleasure! :)

a few more stats, and a photo of the jeweled pallets:

- weight is 10 lbs 14 ox

- pendulum rod assembly without bob is 4 lbs 6 oz

jeweled_pallets.jpg
 
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bruce linde

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i think the clock pre-dates invar.... my guess would be nickel, but i would be guessing. :)

a clock dealer friend commented that there were things about the clock that seemed more watch-like... as if it were designed and built by a watch person rather than a clock person... which would make sense given that it was a gift from one watchmaker to another.

what do you think they would have used between 1850 and invar/1895?
 

Bernhard J.

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Hi Bruce,

Great clock! For my interest, are the two arms of the anchor adjustable against each other, other than with a fixing screw parallel to the anchor axis? One of my clocks has a screw with a very fine thread perpendicular to the anchor axis and between the two arms, with which the width of the arms can be adjusted very precisely.
 

bruce linde

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Great clock! For my interest, are the two arms of the anchor adjustable against each other, other than with a fixing screw parallel to the anchor axis? One of my clocks has a screw with a very fine thread perpendicular to the anchor axis and between the two arms, with which the width of the arms can be adjusted very precisely.
not adjustable.
 

gmorse

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Hi Bruce,
...what do you think they would have used between 1850 and invar/1895?
Why don't you think the outer components are iron, or much more likely, steel? That was the usual companion metal to brass in these bimetallic compensation systems.

Regards,

Graham
 

bruce linde

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they're probably steel, but you guys know more than i do... what do you think?
 

bruce linde

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Bruce, if you want to know definitively, what the material is, some scrap yards, precious metal buyers and others have begun using spectrometer devices to determine what a material is… maybe you can appeal to someone like that to give reading.
https://extranet.spectro.com/-/media/25BF83F4-4130-4A14-BF30-F1F673974350.pdf
i always say that every clock (or repair) is an opportunity to buy a new tool.... but the best price i could find on a used spectro is $20k.

i think i'm fine knowing they're some kind of steel. really. :)
 

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