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A grandfather clock (also a longcase clock, tall-case clock, grandfather's clock, hall clock or floor clock) is a tall, freestanding, weight-driven pendulum clock, with the pendulum held inside the tower or waist of the case. Clocks of this style are commonly 1.8–2.4 metres (6–8 feet) tall with an enclosed pendulum and weights, suspended by ...
A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. The advantage of a pendulum for timekeeping is that it is an approximate harmonic oscillator: It swings back and forth in a precise time interval dependent on its length, and resists swinging at other rates.
Johannes Sayler (1597–1668), German watchmaker, Ulm, rolling ball clock, turret clocks, table clocks. Nicolas Lemaindre (1598–1652), French clockmaker, Blois, clockmaker of the court. Jost Bodeker von Wartbergh, German vicar, Osnabrück. craft clock with a centrifugal pendulum (1578 to 1587).
The Jesuits made major contributions to the development of pendulum clocks in the 17th and 18th centuries, having had an "unusually keen appreciation of the importance of precision". [134] In measuring an accurate one-second pendulum, for example, the Italian astronomer Father Giovanni Battista Riccioli persuaded nine fellow Jesuits "to count ...
By this time, the E. Ingraham Company operated five factories and employed more than 500 people who manufactured 250,000 clocks annually. [ 2 ] Edward Ingraham I, the only child of Elias and his wife Julia Hale Sparks, succeeded his father as president of the E. Ingraham Company from 1885 to 1892. [ 4 ]
The timekeeping element, either a pendulum or a balance wheel. It swings back and forth, with a precisely constant time interval between each swing, called the beat. A pendulum movement has a pendulum hangar usually attached to a sturdy support on the back, from which the pendulum is suspended and a fork which gives the pendulum impulses. The ...
The backward motion of the escape wheel during part of the cycle, called recoil, is one of the disadvantages of the anchor escapement.It results in a temporary reversal of the entire wheel train back to the driving weight with each tick of the clock, causing extra wear in the wheel train, excessive wear to the gear teeth, and inaccuracy.
Clocks from Winterhalder & Hofmeier are mechanical precision clocks with the quality standards of Black Forest craftsmanship. [4] [5] The numbers of the dial face are in Roman numerals. The dial face is embraced by wood. [6] The clocks can be identified by the engraved W & H SCH initial letters. Most of the clocks were made from 1850 to 1933.