A chronometer is a high-precision instrument that has successfully passed the entire battery of tests imposed by the COSC (Swiss Official Chronometer Testing Institute), a neutral and independent body which individually tests each movement according to the prescriptions in force.
The certification test for wristwatches with sprung balance oscillators, according to the ISO 3159 norm, consists of observing each movement for 15 days and 15 nights, in 5 positions and at 3 different temperatures (8°, 23°C, 38°C). In order to earn the prestigious chronometer label, a movement’s performances must meet 7 very strict criteria, including a daily variation in rate ranging between only –4/+6 seconds.
The term “chronometer” should not be confused with that of “chronograph”, which is a complicated watch fitted with an additional mechanism enabling the measurement of the duration of an event. A chronograph is not necessarily chronometer-certified, but all BREITLING chronographs carry the much-coveted title of “chronometers”.
Nota bene: mechanical watches endowed with a date, day, month or moon-phase indicator are equipped with a complex mechanism that is set into motion between 8 pm and 3 am. It is therefore vital to avoid adjusting the calendar or moving the time backwards during this period.
The variable tachometer enables one to determine an average speed whatever the distance covered, the time elapsed or the speed reached. It is however an approximate measurement device.
The variable tachometer is composed of a fixed scale (a) and a mobile scale or disc (b). The fixed scale is read off clockwise, and the mobile disc in the opposite direction. The graduations between two numbers represent tenths of units. To read off a result, the decimal point must be placed correctly. For example, the figure 3.2 may represent 0.32, 3.2, 32, 320, etc. The fixed scale comprises three reference marks:
Always place the distance covered opposite the reference mark serving as the basis for the calculation:
N.B. the time measured using the chronograph must be converted if necessary into seconds, minutes or hours to correspond to one of the three reference marks on the fixed scale. For example: 1 minute 20 seconds = 80 seconds; 1 hour 10 minutes = 70 minutes, etc.
If a vehicle covers 1.5km (or 1.5 miles) in 45 seconds, what is its average speed?
Solution: place the figure 1.5 (distance covered) on the SECONDS mark of the fixed scale, then read off the result opposite the figure 45 (interval measured); in this case 120 km/h (or 120 mph).
To multiply 3 x 18, place the figure 18 on the fixed scale or the mobile scale opposite the figure 3. The HOURS mark on the fixed scale and figure 1 on the mobile disc both indicate the result, which is 54.
Division works in the opposite way to the "Multiplication" example. To divide 54 by 2, one need only place the figure 54 opposite the HOURS mark on the fixed scale or figure 1 on the mobile disc. The result is read off opposite figure 2 on one or other of the scales. This single operation produces a complete division table of the figure 54:
Both scales enable one to perform a multiplication and then a division in just one operation. For example, to determine the price of 6 meters of cable, if 1.5 meters costs £ 9, one places the number 9 opposite the figure 6. The result is shown opposite the figure 1.5; in this case £ 36.
Measuring a production rate or an hourly consumption rate follows the same principle as the measurement of an average speed. For example, if a machine produces 15 units in 45 seconds, what is its hourly production?
Solution: place the figure 15 (the quantity produced) on the SECONDS mark on the fixed scale, then read off the result opposite figure 45 (interval measured); in this case 1,200 units per hour.
The pulsometer enables fast calculation of pulse rate. For example, if 27 beats are measured over a 24-second period, one need only place the figure 27 (number of heart - beats) opposite the MINUTES marker, and then read off the result opposite figure 24 (length of observation); in this case 67 beats per minute.
Your BREITLING chronometer may be used as a sun compass, thus enabling you to determine the Northerly-Southerly direction. For regions that have instated daylight saving time, subtract one hour when directing the watch.
Point the hour hand precisely towards the sun. In relation to the watch dial, the point located midway between the current time and 12 o’clock indicates the South, the North being exactly opposite.
Point the hour-marker located at 12 o’clock on the dial precisely towards the sun. In relation to the watch dial, the point located midway between the current time and 12 o’clock indicates the North, the South being exactly opposite.
Your Breitling chronometer is a sophisticated instrument that is constantly subjected to a wide variety of stresses and strains. Within a very small volume, a large number of components contribute to handling all the functions. Their mechanical action inevitably leads to a certain amount of wear and tear, which may be controlled by maintenance consisting of renewing the lubrication and replacing worn components. Like any precision measurement instrument, your watch must be regularly maintained in order to function at its highest level of potential: the frequency of this operation varies according to actual use. Breitling or your authorized dealer will be happy to handle the procedure.
The movement of your chronometer is protected by a complex case fitted with gaskets to ensure its water-resistance. Under the influence of various external agents – perspiration, chlorinated or salt water, cosmetics, fragrances or dust – these gaskets gradually deteriorate. That is why water-resistance cannot be permanently guaranteed. If used intensively in water, we recommend having annual water-resistance check conducted. Whatever the case, such an appraisal will be done every two years. This operation, which takes only a few minutes, may be conducted by a Breitling authorized maintenance center, or by an authorized dealer (www.breitling.com).
BREITLING models are water-resistant to varying degrees. The extent of the water-resistance, expressed in meters (M) is a standard value and does not indicate an absolute depth of immersion. The crown and pushpieces must not under any circumstances be operated under water or when the watch is wet. The table below indicates the conditions in which your watch may reasonably be used, according to its degree of water-resistance.
|Activities / degree of water-resistance||3bars / 30M / 100FT||5bars / 50M / 165FT||10bars / 100M / 330FT||50bars / 500M / 1650FT+|
|Shower, swimming, surface water sports||✔||✔||✔|
|Water-skiing, dives, snorkeling||✔||✔|
BREITLING genuine leather straps are crafted with the most refined materials and represent extremely high-quality products. Like all objects in natural skin (shoes, gloves, etc.), their length of life varies considerably, according to the conditions in which they are worn. In particular, water, cosmetics and perspiration accelerate the aging process. A metal or synthetic BREITLING bracelet is thus better suited to activities involving frequent contact with water or humidity.
BREITLING metal cases and bracelets are made from the finest alloys and guarantee sturdiness and wearer comfort. Regular cleaning by rinsing and brushing in clear water will keep your watch shiny. This operation is strongly recommended after each immersion in salty or chlorinated water. For watches fitted with a leather strap, proceed in the same manner, while avoiding getting the strap wet.
Like any valuable objects, BREITLING chronometers deserve special care. It is important to protect them from jarring and knocks by hard objects, and not to expose them to chemical products, solvents, dangerous gases, or magnetic fields. Moreover, your BREITLING chronometer is designed to run smoothly at temperatures ranging between 0°C and 50°C.