The more secure it is designed unidirectional, screw-in , the less practical it becomes for diving. In , Eterna introduced, with its KonTiki Diver, an interesting first fusion of both concepts: the internal bezel could be operated from the outside, a concept that first allowed a water resistance of meters and, in , up to 1, meters with the more radical-looking Concept Diver. In , IWC went all the way and seems now to be offering, for the first time, the best of both worlds: The current IWC Aquatimer family features a system, called Safedive, that combines a unidirectional internal bezel that can only be rotated with a ratcheting external bezel which can be moved in both directions, but only counter-clockwise for adjusting the internal bezel.
The IWC video below demonstrates how it works:. Good morning, please what is the small dial face That has 30 40 20 with a red hand within the main dial face? I ask the purpose of the numerical bezel on a watch. Thank you, Sister T. Certified diver. I use a dive computer and my Seiko as a backup.
In any event, the dive watch is a backup for most divers. We rely heavily on computers. Most dive masters actually have two dive computers one for back up , and a dive watch. Established use of bevel requires the diver to remember the dive time in minutes read from the o on bevel. It is much easier to set the o on the bevel at the required time in minutes for the dive, then one can see quite clEarly the time elapsed without having to remember the dive time.
Works for me all the time. Simply rotating the 60 minute mark on the bezel to the minute hand position when you set coarse allows you to read your ETA for ATC directly off the watch next to your ETE along track on the bezel.
The number on the bezel that the minute hand is pointing to indicates the number of minutes that have elapsed since you set the bezel. From the name itself, you can probably guess the function of this watch bezel. Similar to the count-up bezel, the countdown bezel also has marks from 0 to Also, unlike the count-up bezel, you can rotate the countdown bezel in either direction.
Because of its function, runners and other types of racers are usually the ones who use this bezel. If the count-up bezel measures the elapsed time, the countdown bezel determines the remaining time. The number that the minute hand will be pointing to will tell you how many minutes you have left. The tachymeter is perhaps the most common watch bezel when it comes to motorsports.
It is a fixed bezel. This means that the bezel cannot be rotated, unlike the count-up and countdown bezels. People often use this bezel to measure time, speed, or distance. For measuring speed using the tachymeter bezel, you must first ensure that the distance travelled is one single unit. This could mean that you are determining the time an object spends travelling a distance of either 1 mile or 1km. Locate where on the tachymeter scale your chronograph second hand has landed.
This number is your speed in units per hour. The pulsometer bezel is quite a rare find these days. Watches with this bezel were quite expensive.
The pulsometer meter has a scale starting from moving down to 40 when you read it clockwise. This scale is usually graduated for 15 to 30 pulsations.
The number that the second hand would land on would be the beats per minute heart rate. Telemeter bezels would be most useful for the military. This bezel measures the estimated distance between you and an event that is both seen and heard. In the military, you could use this to measure the distance between you and an enemy based on when you see their gunfire and when you hear it. You could also use this to estimate the distance of a lightning strike.
Start the chronograph once you see the event. For example, you see a lightning strike and press the chronograph to start. Once you hear the thunder, stop the chronograph. The second hand would be pointing at the approximate distance between you and where the lightning struck.
From the name itself, you can probably guess what this watch bezel does. The compass bezel is marked with the four directions and often the degrees in between. What is a tachymeter? It is a scale on a fixed, non-rotating bezel, which calculates units per hour for chronograph watches. This means it can measure times from 7 seconds to 60 seconds. It is possible to use this type of scale to measure speed or distance, but some measurements may require more mathematical equations than others.
Learn how to use a tachymeter in our comprehensive guide! The pulsometer is one of the rarer scales included on a watch. This is typically found on a medially-designed watch and worn by doctors. This type of addition dates back to the s when doctors needed to accurately measure the pulse of a patient. Similar to the tachymeter scale measuring units per hour, the pulsometer measures heart rate within a minute. The scales are calibrated from 15 to 30 pulses around the dial, starting around the 5 second mark at Doctors would start the chronograph and count the beats up to what their watches were rated to and then stop the chronograph.
When they stop, they would be able to read the heart rate in beats per minute based on where the seconds hand lined up on the pulsation scale. Also similar to the tachymeter is the telemeter, which can also be mistaken for the former due to their similar names! This type of scale is less common and is used to measure the distance between a visible event and an audible event.
The best way to describe this type of scale is by looking at a thunderstorm. For instance, you would start the chronograph when you see the lightning flash and start it when you hear the thunder. The chronograph will lay atop the distance, typically measured in kilometers.
It can be easily recognised by the distinctive scale that is primarily used for scientific and industrial measurements.
In combination with the chronograph, a time measurement can be easily converted into a decimal or percentage for use in longer calculations. While some rounder time stamps are easy to proportionately convert into decimals, this tool renders the task relatively simple for more complex time readings.
Nevertheless, it is possible to have a GMT without the rotating bezel. In this case, the 24 hour ring will be planted around the rehaut between the indices and the edge of the dial. In both cases, the GMT hand circles the dial, making one full rotation in a hour period. For watches with a rotating bezel, they sometimes feature two colors designed to showcase day or night hours.
A rotating bezel also allows for the use of a third timezone if needed. A chronograph is a very common watch feature that functions as a stopwatch. What the tachymeter does is let you find the unknown distance or speed, given that you have one of them already and combine it with time elapsed. One example of this is if you are a race-car driver and you travel for one mile in thirty seconds.
Using these two metrics, you can find how fast you were going on your bezel. That number would be MPH. This type of watch bezel is a favorite of driving enthusiasts and pilots. In the world of timepieces, you have a significant amount of choices. The most common are brand, price range, materials and style, but there are a few critical decisions that fly under the radar.
One of them is watch bezel type. When choosing your next watch, think about the utility and aesthetics of watch bezels and decide which serves your needs best. When you do, you will be one step closer to purchasing the perfect watch for your needs. Charles Miller Updated: Dec 01, Post comments. Leave A Reply Your email address will not be published.
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