A watch is an instrument of time measurement that is worn on oneself. A watch differs from a clock, a pendulum or any other time measuring instrument by the fact that it can be carried during movements without its operation being altered.
The first watches are worn in a vest pocket, jacket or jacket (pocket that was called gusset, hence the name pocket watch), or even attached to the end of a ribbon or a chain fixed at the top of the pants or pants.
Types of watches and features :
Beyond giving the time, a watch can have advanced functions and indicate the date, chronometer or even for so-called “smart watches” act as a mini-computer, have Bluetooth or Wi-Fi connectivity.
Many watches are waterproof to varying degrees, from splashing to underwater diving. There is a standard of water resistance levels depending on the depth but the numbers are only arbitrary. A recent model has even proved its watertightness at 3 900 meters below sea level17.
Guide on sealing watches18
Dive watches, specifically designed for underwater activities, meet the ISO 6425 standard and are guaranteed by manufacturers perfectly waterproof at the depths indicated on the dial. Some manufacturers like Omega or Rolex do not hesitate to test their watches individually beyond the maximum depth indicated on the dial.
Watches that are not specifically designed for scuba diving are also often indicated as waterproof but do not meet the same standard. To be able to use the term water resistant, they must meet the ISO 2281. It is therefore important to consider the figures put forward by manufacturers as indications rather than as guarantees, unlike diving watches where the indicated depth is guaranteed.
A smartwatch, literally “smart watch”, is a computerized wristwatch with many features.
Watch for blind
There are analog watches for the use of people with blindness, whose windows are lifted to allow them to touch the hands in order to know the time. There are now other systems, for example, which state the time vocally or give the time by inaudible and discrete vibrations.
A “talking” watch is a watch giving indications of the time audibly. It only appeared in the twenty-first century.
The display consists of a fixed dial on which hands move whose position indicates the time. One usually finds an hour hand and a minute hand. The watch can also have a second hand.
The dial does not necessarily have numbers but only indexes or sometimes nothing at all. Typically the dial has twelve hours numbered from one to twelve, each hour corresponding to five minutes. The needles are rotated about an axis, the hour hand is thus twice round the dial in one day when the minute hand is turned around in one hour, or twenty-four turns per day. According to the sexagesimal system, reading the position of the hour hand and then that of the minute hand indicates the time.
There are also watches with 24-hour dial, the hour hand is in this case the complete turn of the dial in one day.
Hours, minutes, and seconds are displayed with numbers on a liquid crystal display, which can be a 7-segment display. There are no needles, it can be in the form of discs or rollers scrolling behind wickets (we find this type of display on watches with analog display for the date of date for example). this type of display on all LCD watches mass produced by Japan.
Some watches include both types of displays, analog (hours, minutes, seconds) and alphanumeric LCD (date, chronograph, time zones, etc.).