Clocks

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Clocks

Post  eddie on Sun Jun 19, 2011 3:56 pm


Deadbeat escapement used in many pendumlum clocks.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:06 pm


Astronomical clock and animated figures- Prague.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:09 pm

Atomic clock:


FOCS 1, a continuous cold caesium fountain atomic clock in Switzerland, started operating in 2004 at an uncertainty of one second in 30 million years.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:11 pm


Candle clock.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:16 pm


Congreve's Rolling Ball clock as it appeared in his patent application of 1808.


A Rolling Ball clock from 1820 in the British Museum.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:18 pm


Basic digital alam clock without a radio.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:20 pm


Electric clock.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:23 pm


Hourglass.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:25 pm


Replica of ancient Chinese stick incense clock.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:28 pm


The movement in a Russian mechanical watch.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:30 pm


18th century oil-lamp clock.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:35 pm


Pendulum clock conceived by Galileo Galilei around 1637. The earliest known pendulum clock design, it was never completed.


German 19th c. pendulum wall clock.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:38 pm


A scale model of Su Song's Astronomical Clock Tower, built in 11th century Kaifeng, China. It was driven by a large waterwheel, chain drive, and escapement mechanism.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:41 pm


An elephant clock in a manuscript by Al-Jazari (1206 AD) from The Book of Knowledge of Ingenious Mechanical Devices.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:44 pm


A linear clock at London's Piccadilly Circus tube station. The 24 hour band moves across the static map, keeping pace with the apparent movement of the sun above ground, and a pointer fixed on London points to the current time.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:48 pm


Quartz clock.

Wiki:

A quartz clock is a clock that uses an electronic oscillator that is regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency, so that quartz clocks are at least an order of magnitude more accurate than good mechanical clocks. Generally, some form of digital logic counts the cycles of this signal and provides a numeric time display, usually in units of hours, minutes, and seconds. Quartz timekeepers are the world's most widely-used timekeeping technology, used in most clocks and watches, as well as computers and other appliances that keep time.


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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:50 pm


French decimal clock from the time of the French Revolution.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:55 pm


The Seiko Spacewalk is a limited edition Spring Drive model, designed specifically for use in space.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 4:57 pm


Gastown steam clock in Vancouver.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 5:03 pm


Ancient sundial from Marcianopolis.


SSW facing, vertical declining sundial on Moot Hall, Aldeburgh, Suffolk, England.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 5:07 pm


A torsion pendulum or anniversary clock made by S Haller and Sohne in Germany.

Wiki:

A torsion pendulum clock, or torsion clock, is a mechanical clock which keeps time with a mechanism called a torsion pendulum. This is a weighted disk or wheel, often a decorative wheel with 3 or 4 chrome balls on ornate spokes, suspended by a thin wire or ribbon called a torsion spring. The torsion pendulum rotates about the vertical axis of the wire, twisting it, instead of swinging like an ordinary pendulum. The force of the twisting torsion spring reverses the direction of rotation, so the torsion pendulum oscillates slowly, clockwise and counterclockwise. The clock's gears apply a pulse of torque to the top of the torsion spring each rotation to keep the wheel going. The wheel and torsion spring function similarly to a watch's balance wheel and hairspring, as a harmonic oscillator to control the rate of the clock's hands.


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Re: Clocks

Post  eddie on Sun Jun 19, 2011 5:10 pm

Water clock:


A display of two outflow water clocks from the Ancient Agora Museum in Athens. The top is an original from the late 5th century BC. The bottom is a reconstruction of a clay original.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 5:15 pm


Traditional windup (keywound) mechanical spring-driven alarm clock.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 5:27 pm

Chiming Clock:


The Clock Tower (St Stephen's Tower) of the Palace of Westminster, commonly known as Big Ben (in fact, that's the name of the bell), is a famous striking clock.

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Re: Clocks

Post  eddie on Sun Jun 19, 2011 5:31 pm


Cuckoo clock, a so-called Jagdst├╝ck, Black Forest, ca. 1900, Deutsches Uhrenmuseum, Inv. 2006-013

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Re: Clocks

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