In time context means analogue display that the clock displays the time using the opposite hand analog display, digital display where the time is displayed on an LCD display.
A watch with alarm has some sort of reminder.
The glass of a watch is often anti-glare, in praktieken this means that you can check the time even though the sun is shining on it.
ATM stands for the atmospheric pressure, when a watch is immersed in water so arises a pressure. An ATM is approximately 10 meters.
To be able to swim with a watch it is recommended to withstand 10 ATM which is about as much as 100 meters.
If you want to dive with his watch it is recommended to withstand 20 ATM.
Arab merchants introduced in medieval times the numbers we use today in the Western world.
They are therefore called Arabic (0, 1, 2, 3, 4, 5, 6, 7, 8, 9).
A watch with battery indicator shows have an indicator that shows when the battery is running low and need to be replaced.
The case is the shell which the watch is mounted in.
It can be made of materials such as steel, gold, titanium or platinum.
The diameter of a watch refers to the measurement of the outside of the watch between three o’clock and nine (excluding crown).
A perpetual calendar takes into account month length and leap years.
A leap day is added every year that is evenly divisible by four, however, there are exceptions when the year is divisible by 100 but not the 400th.
This means that, for example, in 2100, 2200, 2300 and 2500 are not leap years even though they are evenly divisible by four.
Only the most sophisticated watches with perpetual calendar takes into account these exceptions.
When a clock is ten minutes past ten or ten minutes in two so it is said that the clock smiles. Watches photographed in a marketing context usually photographed when they are happy.
The glass of a watch comes in two main varieties: sapphire and mineral glass.
Most exclusive watches manufactured nowadays has sapphire crystal.
Sapphire glass is very scratch resistant.
Mineral glass has the advantage that it is not possible to pieces if crushed.
GMT, Greenwich Mean Time, the time zone that is defined to coincide with the UTC (Coordinated Universal Time).
UTC is the basis for civil times and keep using atomic hear much precision.
In time context means GMT to clock supports two time zones.
Power reserve is the time a bell goes after it became assignments (or kinetically charged).
Quartz has a running time that lasts the time between battery replacement.
Power reserve indicator
Some watches have a display that shows how much spare time you have left.
This dislay called power reserve indicator
The height is measured from the bottom to the top of the watch.
To minimize friction and increase time accuracy so used jewels as bearings in time the system is on a watch.
Jewels manufactured in the same manner as sapphire glass (often used for glass in a watch).
When a movement has many jewels as suggesting it is often of good quality.
Caliber refers to the movement of a watch and its movement.
An advanced caliber can run several complications like chronograph, perpetual calendar and minutrepetion.
Indirectly, it is also the caliber that determines how long the power reserve a watch has.
Ceramics is an increasingly common material used in the manufacture of watches.
It is a very durable and scratch resistant material.
The material also has the advantage that it retains its color and luster over time.
A watch that has extra features such as chronograph, perpetual calendar, etc. have complications.
A watch with many such complications (extras) is called “grande complication”.
The crown is a button that is used among other things to set time and date, and turn up the watch.
It is usually placed at three o’clock on the clock.
Chronograph is a complication that is used to measure time intervals.
A chronometer is a watch that went through precision tests at an independent institute.
Quartz is a rock crystal in the watch industry, in that it is set into vibration by an electronic circuit.
Today they use synthetic crystals that after grinding can keep a very constant frequency.
Quartz watches are usually very accurate and is also known as battery-powered watches.
In a preferred automatic watch a drive spring up through a rotor, the energy of the rotor to move, the kinetic energy of the carrier provides.
If the wearer puts down the watch to keep the generated energy (once reserve) watch running.
Power reserve typically lasts one to three days.
A mechanical watch is pulled up by hand.
The energy generated (once the reserve) is usually one to three days.
PVD (Physical Vapour Deposition) is a surface of a material.
This provides a surface that is durable and has low friction.
Mother of pearl (MOP, eng. Mother of Pearl) is also called Nacre and is an organic composite materials.
The material is sometimes used in the manufacture of dials.
Tissot was the first brand to manufacture a watch entirely of nacre.
The ring or bezel is the metal frame is attached to the watch glass the watch face with.
It can be fixed or variable in one or both directions.
Screw Crowns are often used in diving bells, the crown is screwed in to water should not be allowed to enter.
A valve for deep sea diving from diving bells can be used to prevent overpressure in the watch.
A tachometer is a scale for measuring velocities.
Tachometer convert seconds (maximum 60) to kilometers per hour.
To use the tachometer so, a reference distance is provided.
Water Resistance Guide
A watch rated as Water Resistant may come in contact with water to a predetermined extent. Most watches have a measurement until which the depth of immersion is safe. It is important to remember that a water-resistant rating is based upon optimum conditions in a laboratory. Real life experience & aging of the gaskets will effectively decrease the manufacturer’s specifications of water resistance over time. When water comes in contact with the movement, it is the worst scenario that can happen to a watch – thus we strongly suggest that you always work well within the parameters of the manufacturer’s recommendations and have your watch tested at least once a year. Any competent watchmaker has the necessary equipment to test water resistance.
Water resistance on a watch is obtained by 3 important factors:
1. Case back – this refers to how the case back is attached to the watch.
2. Crown – the single most important factor to ensuring Menuswater resistance.
Real Life and Water Resistance
When a watch is tested by the manufacturer it is done in a laboratory under optimum conditions, such as a fresh gasket, sitting stationary in a pressured water tank and with still/motionless water. However, real life action will produce completely different results. Here are a few scenarios:
Water Resistance vs. Water Proof
The U.S. FTC (Federal Trade Commission) which enforces the truth-of-advertising has deemed the term “Waterproof” inappropriate. In their opinion, a watch can never be 100% truly impervious to water, as the gaskets deteriorate over time & exposure, thus reducing the specified depth of water resistance. In the words of the FTC “The word proof connotes a measure of absolute protection that unfortunately does not exist with respect to watches, especially over prolonged periods of time.” The FTC has found the term Water Resistant to be more appropriate.
Water Resistance Testing Methods
There are 2 commonly used water-resistance testing methods:
ATM is short for “Atmosphere” which is equal to 10 meters. Another word for ATM which is commonly used in Europe is BAR – this too is equal to 10 meters.
The Helium Escape/Relief Valve is used only in extreme deep diving expeditions when a diver operates from a diving bell. As the bell is lowered pressure begins to increases & helium is added to the breathing mix. The helium is added to remove toxic air created by the extreme depth.
Helium is one of the smallest molecules & will seep into the watch through the seals until the air pressure in the watch equals the air pressure in the diving bell. As the diving bell surfaces & decompresses, the helium needs to escape from the watch at the same speed as the decompression – otherwise the pressure in the watch will pop the crystal off. To avoid that, Omega developed the helium escape valve which allows the helium to escape faster than it seeps in. Many brands use the escape valve in one design or another. Generally, the escape valve can be found on watches which have a water resistance rating of 300m or greater.
The helium escape valve never needs to be used in regular scuba diving unless diving in a controlled environment as described above.
Interpretation of the Depth Ratings
Although a watch may be rated 30m/99ft water resistant, it does NOT mean that the watch can be immersed to that depth. The depth rating posted by the manufacturer is theoretical in nature and can only be achieved in a perfectly optimum environment of a laboratory – which is impossible to replicate in real life.
|Water Resistance Guide|
|No Rating – 30m/99ft||Does not allow contact with water|
|30m/99ft – 50m/165ft||Allows for contact with water such as washing hands and rain|
|50m/165ft – 100m/330ft||Allows for light poolside swimming|
|100m/330ft – 200m/660ft||Allows for swimming, snorkeling and showering (do not expose to hot water)|
|200m/660ft – 500m/1650ft||Allows for impact water sports such as board diving and scuba diving|
|500m/1650ft +||Appropriate for serious deep water diving.|
Obviously, the higher the rating, the more appropriate the watch is for deeper diving.
IMPORTANT: We strongly recommend purchasing a watch with a screw-down crown if you intend on wearing the watch while you are in contact with water.
• Have your watch water-tested once a year.
• Do not shower or swim with your watch unless it is rated 100m/330ft & has a screw-down crown.
• Never open, wind or operate the crown while in water.
• Never press the buttons of a chronograph watch while in water – unless otherwise stated by the manufacturer.
• Do not subject your watch to extreme temperature changes.
• Do not subject your watch to sudden & rapid air-pressure changes.
• Do not allow your watch to come in contact with corrosive chemicals, such as abrasive soaps & highly chlorinated water.
• Ensure that the crown is always pushed in, and if you have a screw-down crown make sure it is always tightened. Double-check before immersing in water.