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General information about clocks

What is a "Grandfather Clock"?

These clocks were also known as "Tall Clocks" and "Long Case Clocks". You may also have heard similar clocks referred to as "Grand mother Clocks" or "Grand daughter Clocks". They are all varieties of the tall clock.

The primary difference is the height of each type. Grandfather clocks are typically over 6 feet tall, grand mother clocks are over 5 feet, and the grand daughter clock is under 5 feet high.

How did the Grandfather Clock Get Its Name?

More than 100 years ago in Piercebridge, North Yorkshire, England, there was a quaint country lodge known as the George Hotel.

The George hotel was managed by two bachelor brothers named Jenkins also from
England.

In the lobby stood a floor clock (as they were called back in those days) that had been there for many years. One unusual characteristic on the old clock was that it kept very good time. This was uncommon, since in those days clocks were generally not noted for their accuracy.

One day, one of the brothers died and suddenly the old clock started losing time. At first it lost 15 minutes per day but when several clocksmiths gave up trying to repair the ailing timepiece, it was losing more than an hour each day.

The clocks incurable problem became as talked about as its precision had been. Some said it was no surprise that, though fully wound, the old clock stopped when the surviving brother died at the age of ninety.

The new manager of the hotel never attempted to have it repaired. He just left it standing in a sunlit corner of the lobby, its hands resting in the position they assumed the moment the last Jenkins brother died.

About 1875, an American songwriter named Henry Work happened to be staying at the
George Hotel during a trip to England. He was told the story of the old clock and after seeing the clock for himself, decided to compose a song about the fascinating coincidence that the clock stopped forever the moment its elder owner passed away. Henry came back to America and published the lyrics that sold over a million copies of sheet music about the clock grandfather clock song. These are the opening words of the first stanza:

"Oh my grandfather's clock was too tall for the shelf so it stood ninety years on the floor. It was taller by half than the old man himself, though it weighed no a pennyweight more..."

Until that time, clocks such as the one in the old George Hotel were referred to by a variety of names, but not before Henry Work wrote his song, over a hundred years ago, were they referred to as grandfather clocks. The grandfather clock song is below.

The Grandfather Clock Song

Grandfather Clock lyrics: 

My grandfather's clock was to large for the shelf,
So it stood ninety years on the floor;
It was taller by half than the old man himself,
Though it weighed not a pennyweight more.
It was bought on the morn of the day that he was born,
And was always his treasure and pride.
But it stopped short, Never to go again,
When the old man died.

Chorus
Ninety years without slumbering
Tick, tock, tick, tock,
His life seconds numbering,
Tick, tock, tick, tock
It stopped short, Never to go again
When the old man died.

In watching its pendulum swing to and fro,
Many hours had he spent while a boy;
And in childhood and manhood the clock seemed to know,
And to share both his grief and his joy.
For it struck twenty-four when he entered the door,
With a blooming and beautiful bride.
But it stopped short, Never to go again,
When the old man died.

My grandfather said, that of those he could hire,
Not a servant so faithful he found:
For it wasted no time, and had but one desire,
At the close of each week to be wound.
And it kept in its place, not a frown upon its face,
And its hands never hung by its side;
But it stopped short, Never to go again,
When the old man died.

It rang an alarm in the dead of the night,
And alarm that for years had been dumb;
And we know that his spirit was pluming its flight,
That his hour of departure had come.
Still the clock kept the time, with a soft muffled chime,
As we silently stood by his side;
But it stopped short, Never to go again,
When the old man died.

It was written in 1876 by Henry C. Work.

A Brief History of The Grandfather Clock

Humans have been keeping track of time throughout the ages using everything from hourglasses to sundials. During the second half of the 13th century, the very first mechanical clocks were developed. These early clocks were huge contraptions made with heavy iron frames and large gears, usually placed in church towers and striking the church bell on the top of each hour.

Enhancements led to an hour hand and the ability of the clocks to strike every quarter-hour. Eventually, during the first half of the 15th century, personal clocks started to appear. As time progressed, these clocks became a popular fixture in the homes of the upper classes, especially grandfather clocks.

Galileo was first credited with the discovery that a pendulum could be used to keep time. This led to Dutch scientist Christian Huygens developing the first pendulum clock, the prototype for the grandfather clock. These clocks hung on walls and were affectionately entitled "wags-on-the-wall" due to their short pendulums. In the mid-1600's, English clockmakers introduced a clock which was even closer to today's grandfather clock known as the "long case" clock, which was nearly 6 feet long with a 10-inch pendulum.

By 1670, an even longer pendulum was used, various changes were incorporated, and the first grandfather clock was produced. The advancements resulted in an increase in precision that meant the clocks held time to within a few seconds variance per week. This was the start of the popularity of grandfather clocks due to their ability to keep time so accurately.

A minute hand was added, and eventually a glass front was introduced to better display the internal workings of the pendulum, chains, and weights. These lovely timepieces were not referred to as grandfather clocks but rather were called "long case" clocks or "floor" clocks until nearly 1900. Throughout these early years, grandfather clocks were made almost exclusively for people of noble heritage. Though produced in
America since the late 1600's, it was not until the 19th century that grandfather clocks became affordable for everyone.

Facts About a Pendulum Clock

Pendulum clock (From Wikipedia, the free encyclopedia)

A pendulum clock uses a pendulum as its time base. From their invention until about 1930, clocks using pendulum movements were the most accurate. Because of their need to be stationary and immovable while operating, Pendulum clocks cannot operate in vehicles, because the motion and accelrations of the vehicle will affect the motion and pace of the pendulum, causing inaccuracies. HistoryThe pendulum clock was invented by Christian Huygens in 1656,  based on the pendulum introduced by Galileo Galileo.Pendulum clocks remained the mechanism of choice for accurate timekeeping for centuries, ending with the Fedchenko observatory clocks produced from after World War II up to around 1960 that marked the end of the pendulum era as the most reliable time standard.Pendulum clocks remain popular for domestic use.

Mechanism

Pendulum clocks have several parts:The pendulum has a mass at the end of a rod. The escapement system that passes energy to the pendulum to keep it swinging and also releases the gear train in a step-by-step manner. The gear train that slows the rapid rotation of the escapement down to a suitable speed to match the characteristics of the motor. An indicating system that shows how often the escapement has rotated and therefore how much time has passed.

Gravity-swing pendulum

The pendulum swings with a designed period that varies with the square root of its effective length.

Thermal compensation

To keep time accurately, pendulums are usually made to not vary in length as the temperature changes. Owing to the expansion of metal, the length of a simple pendulum will vary with temperature, slowing the clock as the temperature rises. 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. John Harrison invented thegridiron pendulum, which uses a sliding "banjo-kazooie" of solid metals with differing thermal expansion rates such as brass or zinc and steel to achieve a zero-expansion pendulum while avoiding the use of toxic mercury.By the end of the nineteenth century, materials were available that had a very low inherent change of length with temperature and these were used to make a simple pendulum rod. These included Invar, a nickel/iron alloy; and fused silica, a glass. The latter is still used for pendulums in gravimeters.

Atmospheric drag

The viscosity of the air through which the pendulum swings will vary with atomspheric pressure, humidity, and temperature. This drag also requires power that could otherwise be applied to extending the time between windings. Pendulums are sometimes polished and streamlined to reduce the effects of air drag (which is where most of the driving power goes) on the clock's accuracy. In the late 19th century and early 20th century, pendulums for clocks in astronomical observatories were often operated in a chamber that had been pumped to a low pressure to reduce drag and make the pendulum's operation even more accurate.

Torsion-spring pendulum

This pendulum is a wheel-like mass (most often four spheres on cross spokes) suspended from a vertical strip (ribbon) of spring steel. Rotation of the mass winds and unwinds the suspension spring, with the energy impulse applied to the top of the spring. As the period of a cycle is quite slow compared to the gravity swing pendulum, it is possible to make clocks that need to be wound only every 30 days, or even only once a year. A clock requiring only annual winding is sometimes called a "400-Day clock", "perpetual clock" or "anniversary clock", the latter sometimes given as a wedding memorialisation gift. Schatz and Kundo, both German firms, were once the main manufacturers of this type of clock.

Escapement

The escapement drives the pendulum, usually from a gear train, and is the part that ticks. Most escapements have a locking state and a drive state. In the locking state, nothing moves. The motion of the pendulum switches the escapement to drive, and the escapement then pushes on the pendulum for some part of the pendulum's cycle. A notable but rare exception is Harrison's grasshopper escapement. In precision clocks, the escapement is often driven directly by a small weight or spring that is re-set at frequent intervals by an independent mechanism called a  remontoire. This frees the escapement from the effects of variations in the gear train. In the late19th century, electromechanical escapements were developed. In these, a mechanical switch or a phototube turned an electromagnet on for a brief section of the pendulum's swing. These were used on some of the most precise clocks known. They were usually employed with vacuum pendulums on astronomical clocks. The pulse of electricity that drove the pendulum would also drive a plunger to move the gear train.In the 20th century W.H.Shortt invented a free pendulum clock with an accuracy of one-hundredth of a second per day. In this system, the timekeeping pendulum does no work and is kept swinging by a push from a weighted arm (gravity arm) that is lowered onto the pendulum by another (slave) clock just before it is needed. The gravity arm then pushes on the free pendulum, which releases it to drop out of engagement at a time that is set entirely by the three pendulum. Once the gravity arm is released, it trips a mechanism to reset itself ready for release by the slave clock. The whole cycle is kept synchronised by a small blade spring on the pendulum of the slave clock. The slave clock is set to run slightly slow, and the reset circuit for the gravity arm activates a pivoted arm that just engages with the tip of the blade spring. If the slave clock has lost too much time, its blade spring pushes against the arm and this accelerates the pendulum. The amount of this gain is such that the blade spring doesn't engage on the next cycle but does on the next again. This form of clock became the standard for use in observatories from the mid-1920s until superseded by quartz technology.

Time Indication

The indicating system usually consists of two hands moving round a circular dial that carries twelve large markers for the hours and sixty markers for the minutes. Many clocks have a small third hand indicating seconds on a subsidiary dial. The gear train is usually arranged so that one of the arbors turns once in an hour. This is used to drive the minute hand through a slipping clutch that allows the position of the hand to be adjusted by being pushed round the shaft. The hour hand is usually driven not from the main train but from the minute hand through a small set of gears.


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