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Orological Ournal

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Orological Ournal B March 2009 orological H ournal I J In Breguet's Footsteps... Derek Pratt FBHI describes double wheel escapements. When Abraham Louis Breguet made the Previous watch escapements such as the balance directly. This, too, was first ever tourbillon, No. 282, in the early the verge, cylinder or duplex impulsed surely a good idea. The new detached years of the 19th century, he used an the balance directly via the escape- escapement functioned somewhat in Arnold spring detent escapement. Later, wheel teeth. In the lever escapement the manner of detent escapements but he modified a John Arnold watch, which impulse was not delivered directly to the gave direct impulse in both directions of he then returned to its maker fitted with balance by the escape wheel, and it the balance. a tourbillon carriage and Peto cross- required oil between the escape-wheel Breguet used the échappement detent escapement. Although this watch teeth and pallets. On the other hand, the naturel in his finest early series of was converted a few years after No. 282 various versions of the detent tourbillons but eventually abandoned it was made it had a lower number, 169. escapement impulsed the balance in favour of the lever escapement. Detent escapements impulse the directly via the escape wheel and did Although the design showed great balance only once per oscillation, which not require oil on the teeth. By promise, and fulfilled his requirements is not ideal for a portable timekeeper. At combining the best features of both of natural lift and non-dependence on this time, Breguet was experimenting these escapements, Breguet sought to oil, there were inherent faults which he with escapements and eventually produce a superior double-impulse never completely overcame, despite developed a design which he called the escapement that did not depend on oil. various changes in the design. échappement naturel. Breguet has been quoted as There were two main problems. The The échappement naturel 1, was exclaiming, ‘Give me the perfect oil and first was that the twin escape wheels devised to combine the advantages of I will give you the perfect watch!’ As the were mounted on gears which linked both the lever and detent escapements. stability of 19th century oils was very them together. The escape wheels The then relatively new lever uncertain, Breguet was clearly on the therefore moved at the same time but escapement had the advantage that it right lines to dispense with oil rotated in opposite directions. This is an impulsed the balance at each vibration, altogether. He favoured what he called unfavourable arrangement because the or twice per oscillation, but it achieved natural lift, which is simply another term inertia of the system is high and it would this via an intermediary component, the for impulse but with little sliding action, be better for the wheels to move lever. This was an entirely new concept. where the escape-wheel teeth engage alternately anyway. The second After Daniels: ‘Escapements’ 1. Breguet's échappement naturel. The left-hand escape wheel and pinion are driven by the train.The right-hand escape wheel is driven by the pair of toothed wheels from the left-hand wheel. Therefore both escape wheels move together but turn in opposite directions. A triangular locking jewel on the lever (shown in green) locks each wheel alternately. Unlocking is controlled by a ruby pin on the balance roller engaging a fork on the lever in a similar manner to that of a lever escapement. After Ulysse Nardin The balance is impulsed by one or other of the wing-like impulse pallets (dark blue). As shown, the balance is turning in a 2. The Ulysse Nardin Dual-Direct escapement has much in clockwise direction and the tooth of the right-hand escape common with the échappement naturel. The inertia problems wheel locked on the triangular pallet is about to be unlocked. experienced by Breguet have been overcome by using new The next tooth will impulse the balance. On the return vibration technology. A later version is more efficient and is in regular of the balance, the left-hand escape wheel will deliver the production. impulse in the anti-clockwise direction. 106 March 2009 Horological Journal problem was caused by the necessity to discard the échappement naturel in Thomas Mudge’s lever escapement for clearance between the gear teeth. favour of the lever escapement with its was developed steadily during the 19th As only one wheel is driven by the dependency on oil. His various attempts and 20th centuries until the optimum power of the train, the other wheel is to retain oil on the pallets of his lever proportions were established. Work on merely a follower and the clearance escapements, with drilled or slotted other escapements gradually ceased allows it to ‘flutter’ slightly. This means escape-wheel teeth, confirm that he and the lever escapement became the that it is not precisely positioned at all was well aware of the importance of standard watch escapement. It is times, a condition which leads to lubrication but he also knew that it capable of putting up an impressive variable impulse, especially with would be better not to depend on it at performance, especially in the short changes of position of the watch. This all. term. However, in the long term the gives rise to small but unpredictable The Ulysse Nardin Dual-Direct problem of oil dependency remains. errors of rate. Escapement 2, and its derivatives are a Better oils and greases have been Breguet made various versions of the revival of the échappement naturel developed to lubricate the pallets during escapement to try and reduce the principle. Silicon, a new material as far the sliding friction of impulse, but errors. Some watches had a smaller as mechanical horology is concerned, attempts to eliminate lubrication driven escape wheel, with as few as has been introduced to combat the dependency fundamentally have not three teeth, thus reducing the inertia of inertia problem. The escape wheels are generally been pursued until recently. that wheel. It was not necessary for plasma etched from this material, which both wheels to be the same, providing has a lower specific gravity than the George Daniels that the ratio of the drive and number of traditional metals used to make escape In the 1970’s, George Daniels took escape-wheel teeth remained correct. wheels. The use of silicon in this way, another look at Breguet’s échappement Other versions had vertical pins in the plus the diamond-like coating of the naturel. He had unparalleled experience bands of the linked gears to serve as surfaces, is a very interesting hi-tech of Breguet’s work having handled, the tips of escape wheels. This reduced development which we are likely to hear examined and restored most of the the inertia considerably. Another more about in the future. Although the surviving watches. The definitive book, problem, which Breguet apparently did problem of clearance between the gear ‘The Art of Breguet’ was written by not realise at the time, was that there teeth must remain, presumably that of George Daniels in 1974 and by this time was no draw on the locking pallet. The draw on the lever has been addressed. he was already deeply involved with his effect of this was that the lever carrying Time will tell if the Dual-Direct self-imposed task of reviving the the locking pallet was not positioned Escapement has solved Breguet’s flagging fortunes of the mechanical against the bankings with certainty problems with the échappement watch in the face of the quartz watch during the supplementary arc of the naturel. revolution. balance. The concept of draw was still in its infancy. Although the escapement showed much promise Breguet finally abandoned it, rather than gradually eliminate the remaining faults by yet more development work. He concentrated on the lever escapement and made a number of valuable contributions to its development. One may well imagine that he was reluctant 3. In the Daniels Independent Double- Wheel Escapement, the contra-rotating escape wheels are independently driven 4. The first of a series of lever-escapement tourbillons with a one-second remontoire by separate wheel trains. The escape made by Derek Pratt (HJ July 1991). The remontoire is a second escapement, co-axial wheels are alternately locked and with the normal lever escapement. Its purpose is to rewind the small spiral spring unlocked by the lever with 3 pallet jewels which provides the impulse to the balance. This spring is the sole connection between for locking. The balance is impulsed the escape pinion and the escape wheel. The action of the remontoire is controlled by a directly by the escape wheel teeth acting 3-lobed cam (Reuleaux Triangle) embraced by a fork. Later watches had ruby cams. on the roller impulse pallets. Photo: Toni Baggenstos. Horological Journal March 2009 107 5. The Pratt Independent Double-Wheel Escapement for use in a tourbillon watch. Once again, the sole link between the escape pinions and the escape wheels is the spiral 7. The lower pivot of the tourbillon impulse spring. The escape pinions engage the two fixed 4th wheels. The outer wheel carriage is located in the central jewel. has internal teeth and the inner wheel conventional teeth. Note that the teeth are on The 3rd wheel driving the carriage is just slightly different planes. The escape wheel units turn in opposite directions. visible adjacent to the jewel. As the carriage rotates, the twin escape pinions (drawing left) rotate around their axes, driven by the fixed fourth wheels, but in opposite directions. The fourth wheels and escape pinions have the same tooth counts but the internally-toothed wheel has a larger module.
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