The chronograph regularly features at the highest point of people’s arrangements of the most cherished or wanted complication. Regardless of whether it’s timing laps at the track or contractions in the conveyance room, most chronograph wearers cannot wait for the following reason to press those pushers and set the gears in motion.
If the standard chronograph is quite respected as far as capacity, beauty, and designing, at that point the split-seconds chronograph takes that to an unheard of level. Commonly known as the rattrapante, yet additionally referred to as a doppelchrono in German, a split-seconds chronograph brings in with the general mish-mash a subsequent chronograph seconds hand that can be halted, started, or set back to nothing, allowing you to time different occasions at the same time.
For example, let’s say you want to time the total duration of a race. A straightforward chronograph is all you need for that. Presently, let’s say you also want to have the option to time one lap of the race while as yet measuring its total elapsed time. That’s when a rattrapante is ideal.
The complication was originally proposed for use in planning games. It was first found in pocket watches towards the finish of the 19th century, with Swiss watchmaker Adolphe Nicole taking the credit for its turn of events. Like most complications, the rattrapante eventually made its way into a wristwatch, and Patek Philippe drove the race in the early 1920s. By the late 1950s, Venus calibers, for example, the 179 were generally utilized by any semblance of Breitling (among others). And at that point, a lot later in the early 1990s, IWC’s Richard Habring designed a rattrapante augmentation to the ETA/Valjoux 7750 . Generally present day and reasonably-evaluated rattrapante wristwatches are probably going to utilize a derivation of the 7750.
From the wearer’s perspective, the complication is functionality totally. The chronograph can be started, halted, and reset as normal—usually via the pushers flanking the crown on the right-hand side of the case. The split-seconds work is actuated utilizing an additional pusher, regularly on the opposite side of the case (note the pusher at 10 o’clock in the image above). With the chronograph running and both centrally mounted chronograph seconds hands advancing along the dial, squeezing that additional pusher will cause the hands to “split” into two parts. The primary, which is the main chronograph hand, will proceed with its track around the dial, measuring elapsed time from when the chronograph was first started. The second, additional hand halts abruptly. This allows the wearer to pause and record the elapsed time up to that point, for example, the time taken for a lap, without disturbing the other measurement.
As you can find in the above video, squeezing the additional pusher again will see the split-seconds hand catch up (or “rattraper” in French) to the main chronograph seconds hand, which has proceeded with its joyful excursion. This succession of actions can happen consistently, enabling you to accurately and easily record each lap while also recording the total elapsed time.
The additional functionality on top of a regular chronograph isn’t all that advanced in relative terms, and it’s now frequently created as a module that operates supplementary to the regular chronograph mechanism. Instead of one focus wheel, which is associated with the chronograph seconds hand, there are two wheels, each of which is associated with one segment of the “combined” chronograph seconds hand.
As the wheel for the primary chronograph seconds hand rotates, it also drives the rattrapante seconds hand wheel, which rests in the heart-shaped cam of the main wheel. Under normal circumstances, its position is maintained by a spring pushing against it to keep it in that absolute bottom of the cam. The two wheels, and therefore two hands, travel in synchronized movement until the rattrapante pusher is actuated.
When the rattrapante pusher is actuated, the two arms that have been sitting ready in anticipation will successfully clamp the additional wheel in position, pausing the movement of the rattrapante seconds hand. At this point, the additional rattrapante wheel is unseated from its mounting inside the heart-shaped cam of the primary wheel while the main chronograph seconds wheel keeps on turning. At the point when the clamp is released, the spring bounces the rattrapante haggle in accordance with the main chronograph hand.
Take a glance at this clever video from Lange for some perspective.
One of the reasons the rattrapante is uncommon under a certain value bracket is the accuracy that’s need to unite the entire thing. The split-seconds hand needs to sit completely in accordance with the direct, and it needs to snap back without issue. It also needs to have sufficient power from the spring to stay in a state of harmony as the two hands travel together around the dial, however insufficient power to cause a falter or easing back of the main seconds hand as the additional wheel is secured place.
As I referenced above, outside of rather costly in-house calibers, the development you are for the most part liable to see featuring a rattrapante chronograph complication is an altered 7750. At the point when IWC’s patent on the Doppelchronograph terminated, Richard Habring took advantage of the chance to utilize the same designing in his Habring2 brand, and the complication remains a focal purpose of his watches right up ’til today. In their Doppel range, Habring2 combines the complication with a two-register layout for a clean plan. The latest watch in the arrangement, the Doppel 3, is restricted to approximately 20 pieces each year with a cost of 6,750 EUR.
With a relatively affordable arrangement now also more accessible to other people, the rattrapante is not, at this point exclusively saved for top of the line chronographs, although it is still far from common and still commands a robust premium above a more vanilla 7750 chronograph. One of the later examples of an ETA-based, split-seconds chronograph is Sinn’s 910 Anniversary Edition —a restricted release of only 300 pieces retailing at $5,940.
In the universe of need to feel superior that is the watch business, the split-seconds chronograph was never going be the pinnacle of achievement in this domain. In 2013, A. Lange & Sohne created the world’s first “Double Split” chronograph, where it isn’t just the seconds hand that is capable of splitting (and re-catching), yet in addition the moment totalizer. And if this weren’t enough (and it never is), 2018 saw the German horological force to be reckoned with go above and beyond with the “Triple Split,” where the hours are presently also remembered for the rattrapante work. Obviously, it is far-fetched that the triple-split chronograph will stream down to the lower estimated portion of the market any time soon.