When did the tuning fork lever appear in history?
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  1. #1
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    When did the tuning fork lever appear in history?

    Gentlemen,
    Recently I came across an English movement with tuning fork lever. Could anybody tell me that when did the tuning fork lever appear in history?

  2. #2
    Member AbslomRob's Avatar
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    Re: When did the tuning fork lever appear in history?

    I'm not sure I understand your question. A "Tuning fork" movment is an electric-powered movement that uses circuits to cause an actual tuning fork to vibrate. Tiny pawls attached to one of the tines are used to drive a small gear, which in turn drives the rest of the movement.

    A "lever" normally refers to a pivoted strip of metal that interacts with a balance wheel (on one end) and an escape wheel (on the other).

    So what do you mean when you say a "tuning fork lever"?
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  3. #3
    Member radger's Avatar
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    Re: When did the tuning fork lever appear in history?

    Quote Originally Posted by lanzhou View Post
    Gentlemen,
    Recently I came across an English movement with tuning fork lever. Could anybody tell me that when did the tuning fork lever appear in history?
    Hi Lanzhou,

    I'm afraid I cannot find the answer to your question as to when the 'tuning fork' lever first appeared in history.

    It is a rare type of English lever which was only used on the English double roller, ratchet wheel escapement and can be
    seen described in 'Clock And Watch Escapements' by W J Gazeley.

    Unfortunately, Gazeley gives no clue as to when the 'tuning fork' lever first came into use.

    The double roller was invented by Thomas Mudge and was used in the very first detached lever watch ever made but I think the tuning
    fork lever would be much later, late 19thC I'd guess.

    Have you a picture you could post of your watch?

    here is a picture of a tuning fork lever compared to a 'standard' English lever, taken from my thread on an English double roller chronometer.

    https://forums.watchuseek.com/f11/obs...nt-536219.html

    jackruff, bobbee, eri231 and 4 others like this.

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  5. #4
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    Re: When did the tuning fork lever appear in history?

    WOW! Very interesting. You learn something every day.....

    Thanks for posting that, radger.

    Hartmut Richter

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    Member AbslomRob's Avatar
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    Re: When did the tuning fork lever appear in history?

    Interesting...so "tuning fork" as a description, not a function. What is the function of the two "tines"?
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    Member radger's Avatar
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    Re: When did the tuning fork lever appear in history?

    Quote Originally Posted by AbslomRob View Post
    Interesting...so "tuning fork" as a description, not a function. What is the function of the two "tines"?
    Hi Rob,

    Yes, these are called 'tuning fork' levers, descriptive rather than function.

    I puzzled over the reason for the 'tines' when I first saw this lever type.

    The only reasons, that I can think of, for this lever design is to reduce the levers mass and therefore inertia,
    this 'weight reduction' might also facilitate in the levers 'poise'.
    I've never came across the definitive answer unfortunately.
    Mirius likes this.

  8. #7
    Member AbslomRob's Avatar
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    Re: When did the tuning fork lever appear in history?

    How are the pallet stones attached? Can they be moved in any way?
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  9. #8
    Member radger's Avatar
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    Re: When did the tuning fork lever appear in history?

    Quote Originally Posted by AbslomRob View Post
    How are the pallet stones attached? Can they be moved in any way?
    The pallet stones, usually saphire, are secured in slots in the pallet 'nibs', they are then ground and polished flush with the steel.
    There is no adjustment in the stones themselves, they are effectively 'concealed' and permanent.

    The 'pallet steels' position can, however, be adjusted on the lever to which it is pinned.
    Adjustments for 'locking' are made by either 'topping' or 'preening' the escape wheel (to make it slightly smaller or larger) or by moving the pallets
    closer or further away from the escape wheel by adjusting the jewelling to the pallet holes. As English jewels are fixed into settings or 'chatons'
    then the hole can be moved tiny amounts by filing and burnishing of the setting or sometimes if the hole isn't exactly central in the setting it
    might just need rotated in the plate. The settings in English watches are marked with a punch to line the setting with the plate to ensure the holes
    are correctly centered so there is often adjustment to be had just by rotating the pallet hole jewels.
    eri231 likes this.

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