What’s The Use Of The Central Hand Of The Chronograph

During the Chinese New Year, an advertisement for ‘Pig Pig Page’ exploded in the circle of friends, confirming once again the phrase ‘No matter how widely known, at least hundreds of millions of people in China do not know.’ Although watches have gradually spread in China since the middle of the last century, and have experienced explosive growth since the turn of the millennium, except for first- and second-tier cities, most people have never owned a truly decent watch, let alone know Some history, features, craftsmanship, brands of watches, etc. Therefore, when someone asked me how to operate his chronograph and why the central hand does not move normally, it was not surprising at all. When we walked out of the circle of watch friends, we discovered that the public’s perception of watches was far from what was imagined. So high. As far as the chronograph is concerned, there are many people who don’t even know what the long hand in the center is for.

   In the past, most people had their first watch, which started with a simple three-handed watch. Now it may be a smart watch, and they don’t know much about mechanical chronograph watches. Therefore, when many people get a chronograph, they naturally think that the large central second hand is the hand that normally moves the seconds. They even wonder why the watch does not go, or they do n’t know how it turned on. It’s on for the normal second. Of course, the facts are obvious. The central large second hand of the chronograph is used to record the seconds when the chronograph function is turned on. It is not a regular second hand. The second hand of the chronograph is usually at 9 o’clock or 6 o’clock. It is a relatively small needle.

   In fact, from a common sense, it is also very easy to understand why the central hand of the chronograph is used for timing, because this hand is relatively long, it can indicate the seconds at the edge of the dial, and it can even be subdivided to 1/4, 1/5 seconds. It is very clear to read, but if it is at the position of the small dial, even the specific instructions are tired at every second, it is completely useless for timing, which obviously does not conform to the logic of use. In terms of mechanical structure, because the escapement system is generally on the edge of the movement, the escapement system is directly connected to the second wheel, and the second hand is directly installed on the second wheel, which is simple and saves space. Therefore, the second hand is designed on the edge of the dial. Reasonably, the timing system can also have more room to play.

   Then, as an additional function of the chronograph, it will consume extra energy, so in most cases, it is not recommended to keep it on at all times except to enjoy the game. Except for some high-end models, most of the current chronographs only have forty hours or sixty hours. After turning on the timing, if they are sitting in the office, they will be underpowered and stop. Although a friend who has repaired the watch has suggested that turning on the timekeeping actually has a compensation effect and can make the time move more accurately, but the accuracy of modern watches is not that important for two or three seconds. Basically, it can reach a daily error within 15 seconds. It does n’t make much sense to worry about the few seconds that the compensation came in (even if it can be compensated or not). Instead, it turns on the timer function to accelerate the consumption of lubricating oil, increase unnecessary losses, and the failure rate, which is even less cost-effective.
   After understanding the difference and function of the two seconds hands of the chronograph watch, we can look at some other uses of the chronograph seconds hand. The original chronograph was born for timing, but in addition to timing, many professional functions have evolved according to different fields. Most of these functions do not require additional mechanical structures, but they are very useful.

   The most common application is a tachometer. In fact, the speedometer is not obvious for most events, but when there was no precise electronic timing system in the early days, mechanical timing was the most reliable device. Today, it is a playful function and a heritage and feeling. . As the name suggests, the speedometer measures speed, but it is only suitable for measuring average speed, not real-time speed, so don’t think about measuring car overspeed or something. Its principle is that, with a distance of 1 kilometer as the measurement distance, when the target object starts counting from the start point and stops counting at the end point, the position of the second hand is the average speed. But this requires the target to complete the 1 km in one minute, so if you want to measure the average speed of running, even if you ca n’t run for 1 minute in 1 km, but because of the one kilometer distance sign on the high speed, you can measure the speed. But isn’t there a speed indicator on the dashboard, so it’s okay to just play around. However, some watches have this low-speed speed measurement mode, but it is not very common and the dial is more complicated. And its extended function can be used for documenting. For example, if I move a stack of bricks in 30 seconds, then I can move 120 stacks in one hour (the value of 30 on the dial). If each stack is five cents, it will take an hour. Earn 60 yuan, with an annual salary of 150,000, you can buy a Rolex for the cost of living.

   The next most common is the pulse meter. Pulsometer is a function developed for doctors in the early days. Generally speaking, it is based on 30 pulse beats (there are 15 benchmarks, depending on the model). Record the elapsed time. The value indicated by the second hand is one. The number of pulses per minute. Compared to the speedometer, personally feel that the pulse meter is a bit more practical. If there is no pulse meter at home, then the watch can also come in handy and can be used anytime, anywhere. Of course, the pulse meter is actually a very simple principle. Even without a pulse meter, we can calculate it ourselves. That is, we can calculate the time taken for 30 heartbeats, and then convert it to the number of minutes. You can also watch 15 seconds. Heartbeat a few times, just multiply it by four. It’s just a pulse meter. You don’t have to do it yourself. For doctors, in the past, it was necessary to frequently measure the patient’s pulse, and each of them had to be mentally exhausted. This function would become more important. Now there are electronic pulse meters, which can also measure blood pressure, which is more reliable and practical. Already.

   Less common features are rangefinders. The rangefinder is used to measure distance. Its principle is to determine the distance between the target object and itself according to the difference in the propagation speed of sound and light. Its use method is that the other object flashes light while making a sound. When you see the light here, press the timing button, and then stop the timing when you hear the sound. The scale pointed by the timing hand is the distance between the two sides. Generally speaking, because the speed of light is about 300,000 kilometers per second, the time of the speed of light can be completely ignored when measuring. In fact, the principle of measurement is to determine the distance between the two based on the length of sound. The speed of sound is 340.29 meters / second, if it takes 15 seconds from seeing the light to hearing the sound, it is about 5.1 kilometers.

   The one exception is the Breitling Flight Slider. Although this function is installed in the chronograph model, the chronograph second hand is not directly related to the function of the Flight Slider. The principle of the flying slider is to calculate multiplication and division. It can be used for unit conversion between kilometers and miles per hour, flight time calculation, fuel consumption, climb rate, flight time calculation, etc., but these functions are not directly from the chronograph second hand. The instruction is completed, and it is necessary to combine flight data and rely on the inner and outer circle values ​​of the bezel to convert, so it does not function as a chronograph second hand.
   So, the central chronograph hand on the chronograph, do you understand what it does?