Lcd Wristwatch
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Wristwatch: Band around the wrist by detroit
Portable clocks were already demonstrated in 1500 by about Peter Heinlein built, but in the form of pocket watches . However, there were probably already portable clocks. They were the invention of the mainspring is possible that the drive and the balance (torsion pendulum) to replace the hanging pendulum clock allowed as tie-breaker. They could watch through the shrink to manageable size. However, there was a long time before the pocket.
Further miniaturization of the movement was the turn of the 20th Century, the Clock shrink to bracelet size. At this time it gradually became fashion to wear the wristwatch great ladies pocket watches on the wrist. This fashion was initially dismissed as "effeminate" - Men continue to use the pocket watch at the watch chain. This proved to be unwieldy for some uses, however, as, for example, for pilots who were instructed at that time in their sparsely equipped with instruments on board aircraft in a quick and precise timing. The Brazilian aviation pioneer Alberto Santos-Dumont was inspired by the Parisian watchmaker friend Louis Cartier a Clock for pilots to build, which was worn on the wrist: The Cartier Santos is considered the first wristwatch for men.
After the officers in the First World War found that their pocket watches in the winter and generally under combat conditions proved to be impractical, the watch is set in the military and quickly end in civil society, and was at war, the general standard has become.
The first automatic (a wristwatch with a swing of the pendulum mass) was founded in 1923 by John Harwood built. Harwood had constructed did not appear that Abraham Louis Perrelet already in 1770 a pocket watch with the rotor and the changer (ie on both sides teasing). Later built Rolex automatic watch with one-sided winding rotor and patented it. An Automatic draws the energy for stretching the spring from the arm movements of the wearer.
The first wristwatch with a miniature eletrotechnics quartz element as a clock by the Centre Electronique Horloger (CEH) in Neuchtel, Switzerland, 1967 presented in August 1967 and certified as a chronometer in the Observatory of Neuchatel (IEEE Milestone). This clock had a classical, mechanical pointer display.
In 1970, by Peter Petrov developed the prototype of the first digital watch with an LED display. This was then further developed by the company's Hamilton Watch Company and Electro-Data and was a pulsar known commercially, because the digital display to read because of the high power consumption just by pressing a button for a few seconds was.
The first digital watches with permanent liquid crystal display ( LCD ) came in the period from 1973 to 1975 to the market. The company's founders and Timex in the U.S., and Nepro Mondaine in Switzerland as well as Seiko and Casio in Japan were the pioneers. The first time this allows the liquid crystal displays were obtained from Seiko Epson in Japan, Brown, Boveri & Cie manufactured (BBC) in Switzerland and Ilixco in USA.
Every mechanical watch has a vibrating body is a balance . This resonates with the balance spring predetermined beat number , with classic watches 18,000 (equivalent to 2.5 Hz ) in most modern watches 21 600 (3 Hz) or 28,800 (4 Hz) oscillations in the half hour. Some quick-Schwinger even reach 36,000 vibrations per hour (5 Hz). The balance wheel turns in each passage of the anchor around. By this change it is the escape wheel possible to run a gear on. The anchor and escape wheel to prevent the free release of the spring force on the wheels (see also isochronism ).
The wheels (also called Schwingungszhlwerk) is a quick translation (by the spring of view). The switching transitions of the inhibition are therefore divided down to the minute makes a 1 / 60 revolutions per minute.
The pointer mechanism decreases the strength of the Minutenradwelle and shares the revolutions of the minute wheel change gear with an engine change on the hour tube, which makes the reduction to the slow 1 / 12 turn per hour.
The hour pointer is on the hour tube, the minute hand on the so-called quarter pipe, which, via a slip clutch is attached (which makes the pointer points) associated with the Minutenradwelle or the cannon pinion.
The crown used to adjust the pointer and to wind the watch movement.
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Article Source: http://www.earticlesonline.com/Article/Wristwatch--Band-around-the-wrist/1205315
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