A clock is an instrument used for measuring time, and is one of the oldest human inventions, predated by the sundial. It often consists of a face with numbers or lines from one through twelve, and an hour, minute, and sometimes second hand. Other clock faces may display the time digitally. Clocks may be freestanding, hung on the wall, or worn on the wrist as a watch.
Authored by AH. Last updated 2014-11-04 14:51:24.
Most of us rely on alarm clocks on an almost daily basis, but early alarm clocks were very different than the digital ones of today. Early alarm clocks often had legs and were nickel-plated.
Atomic clocks keep time by means of quartz crystals and periodic radio-controlled synchronization with the NIST atomic clock. Visitors to this website will find comparisons of radio-controlled clocks and watches.
Alarm clocks are a necessity to wake up and get moving in today's busy world. This site features and introduction to alarm clock styles, such as mechanical, electric, and battery operated.
Grandfather clocks not only keep time, they serve as beautiful and elegant pieces of furniture. A grandfather clock typically stands about 7 feet high and has a pendulum and weights beneath the clock.
Visit this time clocks directory to find time clock solution providers throughout the United States. The photograph on this page depicts a traditional, wall-mounted time clock.
A wall clock can serve as a stylish wall decoration in addition to telling time. Modern wall clocks use quartz movements run by battery power, while traditional wall clocks may rely on weights and pendulums.
Clocks are used throughout the world as a means of telling time. Atomic clocks in particular are trusted as the time-telling standard since they are the most accurate measurement available. This atomic clock shows both hands pointing to the twelve.
Cuckoo clocks may be relatively simple or incredibly detailed. This ornate wooden hand-carved cuckoo clock shows the time at almost two o-clock. The detailed carvings include a man chopping wood, two men drinking ale, and several people on the balcony.
Circadian clocks of organisms respond to light signals during night but do not respond in daytime. The time window where circadian clocks are insensitive to light signals is referred to as the 'dead zone'. ...
Science Daily. Tue, 14 May 2019 09:34:11 EDT.
Twice a year, Americans change their clocks in accordance with the federally mandated switch to daylight saving time (DST), a concept first introduced during World War I in order to save energy by maximizing sunlight. ...
Voice of America. Fri, 10 May 2019 08:30:41 -0400.