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Topic: Pendulum clock

Related Topics

Escapement

Clock

Pendulum

Cuckoo clock

Intellectual history of time

Foucault pendulum

Harmonograph

Anchor escapement

Double pendulum

Verge escapement

Simple harmonic motion

Quartz clock

Gear

Spherical pendulum

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	Anchor Clock Escapement
		Clocks needed to be lubricated frequently because the lubricants were not hostile to bacteria, which accelerated their deterioration by causing the formation of fatty acids that corroded metal parts and resulted in the formation of sludge, increasing resistance.
		The first clock to use a pendulum instead of a foliot or balance wheel was produced by the Dutch mathematician, Christian Huygens, in 1657 (although it is claimed that others invented the pendulum clock before he did).
		The pendulum stops at the end of each swing, to some extent because of gravitational force but mostly because of the elasticity of the suspension spring, which serves to change the direction of motion of the pendulum and start it moving again.
	www.abbeyclock.com /anchor.html (3989 words)

	Pendulum clock - Wikipedia, the free encyclopedia
		The pendulum clock was invented by Christian Huygens in 1656, based on the pendulum introduced by Galileo Galilei.
		Pendulum clocks remained the mechanism of choice for accurate timekeeping for centuries, ending with the Fedchenko observatory clocks produced from after WWII up to around 1960 that marked the end of the pendulum era as the most reliable time standard.
		Early high-precision clocks used the liquid metal mercury to lift a portion of the pendulum mass in compensation for the increased length of the suspension.
	en.wikipedia.org /wiki/Pendulum_clock (1122 words)

	A Revolution in Timekeeping
		Another advance was the invention of spring-powered clocks between 1500 and 1510 by Peter Henlein of Nuremberg.
		And in London in 1671, William Clement began building clocks with the new "anchor" or "recoil" escapement, a substantial improvement over the verge because it interferes less with the motion of the pendulum.
		Quartz clock operation is based on the piezoelectric property of quartz crystals.
	physics.nist.gov /GenInt/Time/revol.html (874 words)

	Clock Pendulum Length Adjustment
		The most common method to adjust the correct pendulum length found in clock literature involves counting teeth and pinions to calculate how many revolutions per hour the escape wheel must make, followed by determining how many beats per hour the clock was designed to make and therefore how long the pendulum should be.
		It measures the distance from the axis of rotation to the center of gravity of the pendulum, not to the bottom of the pendulum.
		Record the error and the length of the pendulum (for example, from the middle of the suspension spring to the middle of the pendulum bob).
	www.abbeyclock.com /Pendulum.html (1002 words)

	Frankenmuth Clock Company Black Forest Clocks
		Clocks can be regulated by moving the pendulum bob up or down on the pendulum rod, clocks with metal pendulum have a nut located on the bottom..
		When you replace the clock make sure that the clock is NOT leaning forward-usually there are leg levelers on the bottom of the clock-it is important to reinstall the clock to the manufacturers instructions that came with the clock.
		Once in place, move the pendulum close to the side of the clock and release-when the pendulum slows down to its normal swing it should be running evenly with an even tic-toc.
	www.frankenmuthclock.com /questionsclock.htm (960 words)

	Adjustment and regulation of pendulum for clock speed
		Balance Wheel Clock - Adjustments to this type of clock require a bit of mechanical skill and there are enough variables in design such that adjustment should be discussed in depth for the specific clock with the clockmaker before adjustment by the owner.
		Wall Clocks – The speed adjustment for wall clocks is located at the bottom of the pendulum beneath the circular pendulum bob. This adjustment mechanism is usually a nut or wheel on a threaded rod that allows the length of the pendulum to be changed by turning the nut.
		If the clock is not ticking evenly, then it is out of beat to some degree and will have a loping –uneven sound. Also, the amount of swing of the pendulum after the “tic” will be disproportionate from one side to the other.
	www.kensingtonclock.com /kcsadjust.htm (1236 words)

	How does a pendulum clock work
		So, back in the 1600s people who wanted to create accurate clocks were trying to solve the problem of how to cause the second hand to make exactly one revolution per minute.
		Pendulums are useful because they have an extremely interesting property.
		The period (the amount of time it takes for a pendulum to go back and forth once) of a pendulum's swing is related only to the length of the pendulum and the force of gravity.
	library.thinkquest.org /C0118228/workclock.htm (413 words)

	The Galileo Project \| Science \| Pendulum Clock
		His first biographer, Vincenzo Viviani, states that he began his study of pendulums after he watched a suspended lamp swing back and forth in the cathedral of Pisa when he was still a student there.
		Galileo's discovery was that the period of swing of a pendulum is independent of its amplitude--the arc of the swing--the isochronism of the pendulum.
		In 1602 he explained the isochronism of long pendulums in a letter to a friend, and a year later another friend, Santorio Santorio, a physician in Venice, began using a short pendulum, which he called "pulsilogium," to measure the pulse of his patients.
	galileo.rice.edu /sci/instruments/pendulum.html (956 words)

	Chime Clock Instructions from Bill's Clockworks
		Open the front door and hang the pendulum on the hook (on many clocks the hook is behind the dial), give the pendulum a swing, and the clock will start ticking.
		Once the clock is regulated to keep good time, you will need to set the hands whenever the time is off by more than a few minutes — perhaps every week or two.
		On most clocks, the hour hand is a friction fit on its shaft, and may be moved around to point to the hour that the clock struck.
	billsclockworks.com /opinstructions/chime.htm (1417 words)

	Delightful Machines - The Earl of Meath's Free Pendulum Water Clock
		Although these other free pendulum clocks did not use the "water escapement" devised by the Earl of Meath, it is nevertheless to this tradition of precision free pendulum timekeeping that I feel his clock belongs.
		Meath's 1906 clock is distributed throughout the gatehouse tower it occupies; it is not possible from the published illustrations to fully reconstruct the appearance of the clock.
		In Meath's clock, this signal is indicated by the presence or absence of a vertical flow of water.
	www.marcdatabase.com /~lemur/dm-meath.html (4276 words)

	THE PENDULUM
		Today we know that the period of the pendulum will remain constant as long as the pendulum's angle is no greater than about 20 degrees, and even then, it is not completely precise.
		A pendulum moving along a greater arc traverses a greater distance and its velocity is greater, for it falls from a greater height and at a more acute angle.
		The motion of the pendulum is one of falling, but it does not fall at a constant acceleration because the angle of its descent changes along the length of each movement.
	muse.tau.ac.il /museum/galileo/pendulum.html (1361 words)

	Pendulum Clocks — Infoplease.com
		clock, regulated by a mechanism with a “natural” period of oscillation.
		clock: The Evolution of Mechanical Clocks - The Evolution of Mechanical Clocks The operation of a clock depends on a stable mechanical...
		Anticipating the pendulum swing: as fiscally pinched manufacturers drive changes in automation and control decisions, there are a......
	www.infoplease.com /ipa/A0855495.html (363 words)

	Moseley Clocks antique clock repair
		In some clocks (though not all), the platform is visible under a glass window on the top of the case; in others it is fixed to the back plate.
		Clocks can be positioned anywhere, but this section is a convenient place to talk about a few more different clock styles.
		Originally many of these clocks were housed under a glass dome, but the action of removing the dome to wind the clock once a week meant that most have not survived.
	www.moseleyclocks.com /prod01.htm (2553 words)

	Clock a History - Timekeepers
		With the anchor escapement a pendulum swing was reduced from about 85 degrees to about 10 or 15 degrees, therefore much less energy is needed to keep the pendulum in motion which improved accuracy.
		The Pendulum has a natural frequency that is independent of amplitude and the frequency does not depend on the weight of the pendulum, only its length and the acceleration of gravity.
		The period of a pendulum is influenced by the strength of gravity which varies with latitude and elevation.
	www.ernie.cummings.net /clock.htm (3885 words)

	The MathWorks - MATLAB Digest - June 1999 - How to Build a Clock
		It provides the feedback mechanism needed to ensure that the speed of the clock is not affected by the force from the driver (springs or weights) and wear in the various mechanical parts does not affect the operation of the clock.
		If the pendulum is set to swing at a period of 1 second, the result of the motion of the escapement gear is to move the hands on the clock by 1 second.
		In the case of the clock model, this is a valid assumption due to the remaining pendulum and escapement spring dynamics.
	www.mathworks.com /company/newsletters/digest/june99/clock (4929 words)

	Pendulum Clock
		The clock is driven by a modern 9v Lego motor that is fed power from a LEGO train power regulator (on power setting 2).
		The large white brick object is the lid to the clock.
		The clock's top is easily removed, which is neccessary since I need to reset the clock once or twice a week.
	www.albertelli.com /photoarchive/Lego/clock (290 words)

	Pendulum clock worksheet (Site not responding. Last check: 2007-10-30)
		The different parts of this pendulum clock - the pendulum, the escapement wheel and the other gear wheels - are each composed of rigidly bound groups of balls, each able to rotate around a fixed ball (drawn with cross-hatching).
		The key to how the pendulum clock works lies in the escapement mechanism - the particular arrangement of the two balls at the top of the pendulum and the green escapement wheel below.
		The motive force driving the clock is provided by the small beige gear wheel (which in a real clock could be driven by weights or a coiled spring).
	www.materialworlds.com /sims/PendulumClock/worksheet1.html (280 words)

	A Controller for Electromagnetic Clocks
		The controller requires a pendulum with a one second beat time (custom versions for other pendulum lengths are available on special order).
		The driver circuit works in the basic style used by the Russian F.M. Fedchenko, whose pendulum clocks were among the most accurate ever made.
		It is the natural rate of the free swinging pendulum that you supply.
	www.bmumford.com /clocks/controller.html (461 words)

	Modern Pendulum Clock
		The pendulum rocks back and forth on both sides of the clock face.
		The face is constructed of brushed aluminum and the pendulum is chrome plated steel.
		The clock face is 4" round by 2" deep and the pendulum is 28" long.
	www.littleclockshop.com /pendulum_clock.html (62 words)

	KrazyDad » Blog Archive » The Ascent - A Wooden Clock Kit
		The pendulum shaft is 4 feet, and in order to fit it into the shipping package, it comes in two pieces which must be glued together.
		Like all pendulums, it’s period is controlled entirely by its length, and not by its weight or the width of the arc it makes.
		The reason a pendulum is weighted on the end is to provide a measure of force along the shaft to cause and continue the linear motion.
	www.krazydad.com /blog/2006/01/24/the-ascent-a-wooden-clock-kit (2711 words)

	The Pendulum Equationand how it applies to clocks (Site not responding. Last check: 2007-10-30)
		A pendulum is a falling object, and is subject to the forces of gravity.
		That is why the mass (weight) of the pendulum does not matter for the period, the acceleration due to gravity is the same for all objects.
		In order for a clock to keep time, the pendulum length must be matched to the gear ratios of the movement to achieve a correct beat rate.
	www.gleuenberger.com /clocks/pendulum.htm (1724 words)

	Paxton Pendulum Grandfather Clock
		All technical parts pertaining to the clock head and clock movement are pre-assembled and required no further attention.
		Fortunately, the Grandfather clocks are no longer just for the wealthy, and now anyone can own one of these gorgeous clocks.
		Read about the Grandfather Clocks and learn about their history, how they work and how they got their names.
	www.allclocksonline.com /pendulum_grandfatherclock.html (403 words)

	[No title]
		Most wooden-gear clocks presently available as kits or plans will only run for 1 to 3 days per winding, whereas a properly designed grandfather clock should run for 8 days [20].
		They were responsible for the basic design of the mechanism used in all table and longcase clocks in the 17th and 18th centuries.
		Absolut is a very special wall pendulum clock, whose mechanism is the first of all times entirely made of glass.
	www.lycos.com /info/pendulum-clock--design.html (322 words)

	Scientists & Discovery, Pendulum clocks, Museum Victoria, Australia.
		Galileo is said to have discovered that pendulums keep remarkably good time while watching lamps swing in the Pisa cathedral as a young medical student.
		He noticed that the period of a pendulum (the time of one swing) remained almost exactly the same, even as the lamp lost energy and the size of the swing became smaller.
		Huygens' pendulum clocks were accurate to better than one minute per day.
	www.museum.vic.gov.au /scidiscovery/gravity/pendulums.asp (215 words)

	[No title]
		Cuckoo or pendulum clocks are a practical answer if you want to give a useful present that will last for many years and...
		Huygens had developed his remontoire for a more precise version of his pendulum clock to be used for measuring longitude at sea.
		In the seventeenth century the pendulum clock was developed and by the 18th century clocks were sufficiently accurate for them to be employed at sea for determining longitude and for scientific time measurement.
	www-english.lycos.com /info/pendulum-clock.html (368 words)

	Halfbakery: Swinging Balls Pendulum Clock
		Instead of a single pendulum, one could use the desk toy with hanging, aligned, metal balls that swing back and forth in seeming perpetual motion.
		This wall or grandfather clock would not only be a marvel to watch, but its “tick-tock-tick-tock” would be complemented with a “click-clack-click-clack”.
		Even if a means were included to both regulate the clock and add energy to the swinging balls, they would probably be too imprecise for good timekeeping.
	www.halfbakery.com /idea/Swinging_20Balls_20Pendulum_20Clock (238 words)

	Platypus Productions Personalized Pendulum Clock - Giraffe
		This handcrafted Pendulum Wall Clock serves a practical purpose while a swinging giraffe adds just the right amount of whimsy to your decor and can be personalized with a name.
		Babies are amused with the swinging motion of the pendulum and as he or she grows will learn their numbers, colors and how to tell time.
		This Pendulum Clock measures 7" x 5 1/2" and the clocks vary in length depending on the pendulum length (up to 15").
	www.babyuniverse.com /pro/baby/28731/PersonalizedPendulumClock-Giraffe.html (464 words)

	pendulum clock
		Description: Pendulum clock that was manufactured around the turn of the century.
		The clock has 2 separate winding mechanisms that control the time along with the chime that will broadcast on the hour as you set it.
		The clock is in very good condition, the wood finish is original and has some wear marks on it.
	www.antiqnet.com /detail,pendulum-clock,393087.html (117 words)

	Quartz Clock Movements
		This length is the longest the pendulum can be, but it can be shortened to about 4 inches.
		The back of the pendulum stick is perferated every inch for easy snapping off at the length needed.
		Westminster pendulum quartz movement chimes the Westminster chime on the hour only.
	www.clockworks.com /quartz3.html (406 words)

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