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A mid-1940s alarm clock radio with AM radio stations only A typical 1980s clock radio featuring a digital clock/alarm and an analogue FM/MW/LW receiver. A clock radio is an alarm clock and radio receiver integrated in one device. [18] The clock may turn on the radio at a designated time to wake the user, and usually includes a buzzer alarm.
Philips radio receiver, Model 930A (1931) While Philips' first product was manufactured in 1891, the first product that would fit in the Consumer Electronics division was a television, experimentally manufactured in 1925. In 1927, Philips began producing radios. Only five years later, Philips had sold one million of them.
Basic digital alarm clock without a radio. The mark in the top-left of the display indicates that the time is 4:00pm (16:00), not 4:00am. A 1969 radio alarm clock (Sony Digimatic 8FC-59W) with an early mechanical-digital display. A digital clock displays the time digitally (i.e. in numerals or other symbols), as opposed to an analogue clock.
A modern LF radio-controlled clock. A radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly [1]) referred to as an "atomic clock", is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock.
1970s Copal flip alarm clock. A flip clock (also known as a "flap clock") is an electromechanical, digital time keeping device with the time indicated by numbers that are sequentially revealed by a split-flap display. The study, collection and repair of flip clocks is termed horopalettology (from horology – the study and measurement of time ...
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The word alarm comes from the Old French a l'arme meaning "to the arms", or "to the weapons", telling armed men to pick up their weapons and get ready for action because an enemy may have suddenly appeared. [1] The word alarum is an archaic form of alarm. It was sometimes used as a call to arms in the stage directions of Elizabethan dramas. [2]
Balance wheel in a 1950s alarm clock, showing the (1) balance spring and (2) regulator. Clip of operating balance wheel in a mantel clock, showing motion of balance spring (top center) A balance spring , or hairspring , is a spring attached to the balance wheel in mechanical timepieces .