Pocket watch on a chain appeared in the XVII century, when it was invented clockwork our usual size, which allowed it to fit in a pocket (not on the neck, as was the practice before) for everyday wear. It is noteworthy that with the further invention of the so-called watches, popular watches in the chain has dropped because many people believed and believe still not quite comfortable everyday wear the device for measuring time on the wrist, preferring his own pocket of his waistcoat. It should be noted that the invention of such a clock has been adjusted accordingly and fashion - is gradually emerging jackets with special pockets to separate these watches. Characteristically, the most common combination was the attachment of the chain is not just a remote control or clothing, but to toggle vest accessory. Watch is a device worn on the wrist and serves to indicate the current time and the measurement of time intervals. The most widely used mechanical, electronic and quartz watches. Sundial is a device for determining the time to change the length of the shadow of the gnomon and its movement on the dial. The appearance of these watches is due to the time when people realized the relationship between the length and position of the sun shade on various subjects and the position of the sun in the sky. The simplest sundial indicates solar time, but not local, that is, do not take into account the division of the earth's time zones. In addition, simple sundials do not account for daylight saving time. Use a sundial during the day and only in the presence of the sun. Hourglass is a simple device for measuring the time intervals, consisting of two vessels connected by a narrow neck, one of which is partially filled with sand. Time, during which the sand pours through the neck of another vessel, can be from several seconds to several hours. Mechanical watches use the weight-lifting or spring source of energy. As the vibratory system is applied pendulum or balance control. Masters, manufacturing industry and repaired clocks, called watchmakers. In art, mechanical watches are a symbol of time. Electronic clock is watch that is used for timing the periodic oscillations of the electronic generator, converted to digital signals, repeated at 1 sec, 1 min, 1 h, and so forth, the signals are displayed on the digital display indicating the current time, and in some models as day, month, year, day of week.
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