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  1. D

    Did watchmakers use microscopes in the past?

    Don't know about horology but the book I am reading about Turner mentions that in miniaturists in teh late 1700's used magnifying glasses. Color correction comes into optics in the late 1700's but it it used for long focus telescope lenses. It is not untilthe late 1800's the optical theory...
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    Richard Clarke & Sons Cheapside Pocket Chronometer

    The chronometer involves Earnshaw in that it uses his detent and balance designs but I doubt it was from his shop/ By 1820 Earnshaw was not doing anything he was not signing. I do not know enough to know whether this is possible but could the maker have been Grimalde? BY 1820 he had a partner...
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    Did watchmakers use microscopes in the past?

    Chapuis book on Swiss technology shows an optical comparitor being used to look at gears.
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    Information need from this pocket watch movement

    The click looks like it came from Le Brassus so the ebauche may be by Louis Audemars or by Louis Piguet
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    Unusual part in my chronometer movement an Amplitude Limiter?

    I doubt this chronometer went to any observatory test. The amplitude limiter severely impacts timekeeping. The makers who sent their work to the observatories signed them and that is certain about those in the Hidding list. Also they required that the serial number be engraved on other side so...
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    M I Tobias & Co. ca. 1844

    I have a very similar example in a similarly unmarked god case but more ornately decorated. I paid $1500 for it an auction. I bought it because I was looking for an early compensated lever and because I believed it was a very good price. With large god cased watches value can go very high if...
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    Did watchmakers use microscopes in the past?

    One factor in the development of visual aids is the development of optical design. In the late 1700's Hall and DOlland developed color corrected lenses, primarily for marine spyglasses and Gentlemen's observing telescopes. Optical design of microscopes began with Zeiss in the late 1800's and...
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    Unusual part in my chronometer movement an Amplitude Limiter?

    Yes its and amplitude limiter. Detent escapements do not over-bank; they trip. When a balance w=swings too far on a lever if properly set up the impulse pin will strike the fork which is lock on the banking. It is not good for the movement anad the watch will run very fast when it is doing...
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    A Matile class C chronometer

    Thanks to ETH digitizing I have learned that Matile sent a lot of watches for dertification and that they were competing in all the classes. Here is the Class C result. He had 49 entries pass in ths group. MIne #10808 was the 7th of the 114 in this group. What is more impressive to me is...
  10. D

    Unusual part in my chronometer movement an Amplitude Limiter?

    The photo is not present in your posting. Several makers used amplitude limiters and each used one or more different approaches. They all engaged the balance spring but I have not seen any that were fixed to it. It your movement is before about 1810, you may have discovered another form of...
  11. D

    Care and Use of Pocket Chronometers?

    Yes the fusee rod goes on the fusee arbor, DE Carle has a nice description in his book "Practical Watchmaking" There are two competing problems in optimizing a fusee, the rod is to find the pre set by adjusting the mainspring arbor. The rod adjustment is to get the closest to uniform power...
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    Care and Use of Pocket Chronometers?

    I am not sure what two you refer to but most fusee watches have two winding arbors. One is on the fusee to wind tehe watch and the other is on the mainspring arbor. It is to set up the the tension. Ideally teh fusee keep teh same torque on the gear train and the set up arbor adjusts this.
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    Ebay sale and shipping insurance - has this happened to you?

    Most auction houses very clearly state their approach to shipping. If their terms say its buyer's responsibility I woudl only bid under extraordinary circumstances. One house I have dealt with over seas states they self insure. They ship to the US via a carrier with a good repuation in the US...
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    Ball Vacheron & Constantin Rail Road Pocket Watch

    I have one private labeled to a DC jeweler with a movement that looks a lot like the Ball example. It has a single sunk railroad style dial, black Arabic numbers and red 5 minute track It is 294018. I recall that it is stem set which would have disqualified it for railraod and it is in a gold...
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    Hydepark Pocket watch.

    You can also adjusts the height of the screw head if it is too thick. Yuo can cut it downand keep it decently flat with a emory borad you can but at a local drug store. teh also sell four part fingernail finishing blocks you can use to re-polish the head. It's nto a full black polish but it...
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    Ebay sale and shipping insurance - has this happened to you?

    I have yet to collect on insurance for a missing item and I have had losses. Ebay sides heavily with the buyer so I don't sell that way anymore. When I buy internationally I rely on the seller and so far the ones I have used have been reliable. Before I buy from an international seller I...
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    Ball Vacheron & Constantin Rail Road Pocket Watch

    V&C made a good run at the US railroad market and I have some with otehr private labels made to similar speicifactions. They are superb watches. I had not known of the Ball connection but I have seen otehr Swiss movemetns they used.
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    Ebay sale and shipping insurance - has this happened to you?

    When I was selling on eBay I required buyers to pay for insurance but I still had losees that were not covered so I just do not sell on eBay. If you are going to ship in the US or Canada use registered mail. It slow but safe and reliable. The UK system aligns with US mail so the tracking is...
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    Care and Use of Pocket Chronometers?

    I own and have worn several detent pocket chronometers, spring and pivoted detent. I always buy trousers with a watch pocket and usually wear them in that pocket. I also have vests and I carry watches in the vest pocket. I have had a few near misses that way. If you are wearing a vest and...
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    Hydepark Pocket watch.

    You might try a half round rod fitting in the hole. It will work against the hole and may extract the screw. I usually make replacement screws, but I have a lathe, dies and a screw head tool.

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