The use of stopwatch timer

Correction is the time by which the hours to be corrected to obtain the correct time. If you are delayed for hours, hours correction is positive, if they go ahead, stopwatch timer correction is negative.

Change in hours for one day is called the diurnal cycle. Positive operation is delayed, negative acceleration operation hours, hours Perfection is assessed persistence time of the day, daily phase difference is called the daily variation. The hours are perfect, the average daily variation of less running.By the Middle Ages used the gnomon, sundials, water stopwatch timers, hourglasses and stopwatch timers fire.

In 13th or 14 century appeared the first time roller. The first tower was a time not only hands and odbíjali. Hands appeared only in the late 16th century. A.D., second only around 1800. In the 14th century appeared the online stopwatch timer. In the 15th century appeared the first interior stopwatch timer. The first pocket stopwatch timer was built in 1510. stopwatch timers appeared in the 17th century, this idea was originated G. Galilei. In the 18th century began to use the unrest that allowed oi produce the first portable timepieces. Electric stopwatch timers were invented around the early 19th century. The first stopwatch timers incurred during the first World War II, the first automatic stopwatch timers were patented in 1924, the first quartz stopwatch timer was built in 1927 (the mass produced since 1969). The first atomic stopwatch timer was made in 1949.

The pendulum stopwatch timers have evolved highly accurate astronomical stopwatch timers, used in observatories. Went through various design changes, the most accurate of them are Shorttove hours.

Current hours are often combined with additional features that are not related to time or (blood pressure monitor, pulse meter, radio, calculator, alarm stopwatch timer, and an informer, weather, altitude measurement, measurement of atmospheric pressure, compass, TV ...)
Drive portable stopwatch timer (meaning watch)

Classic watches are powered by coil spring. Spring had regularly tighten (watch stretching) and its pressure through the transmission (gear wheel) to transmit hands showing time. Initially, craning watch daily, later stretching technology improved and watches require winding about once a week. stopwatch timer hours, just like the big stopwatch timer, determines the pendulum. The wristwatch is used (physical) Maxwell pendulum (ie restlessness). It is stored flywheel rotationally coupled with coil spring. Sprockets are mounted on shafts pointed stored in hard metal housings or precious stones with a hole. The watch was indicated by the number of stones (jewels - jewels). The expensive watch, the more stones.

The invention of the automatic stopwatch timer ("samonaťahovacích" h) allows continuous stretching without special user actions: used stretchy called eccentric weight rotor to rotate according to user's hand movements. Stretch rotor movement was transmitted to a device that stretched spring.
Citizen watch1.jpg

The current watches are usually quartz (called quartzky). Power source is stopwatch timer-wise stepper motor controlled by an electronic circuit. Crystal stopwatch timer determines the piezoelectric quartz crystal (oscillator). Power supply circuit and motor ensures battery (galvanic cell).