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Most of a longcase clock's height is used to hold the long pendulum and weights. The two chains attached to the weights and the lack of winding holes in the dial show this to be a 30-hour clock. Traditionally, longcase clocks were made with two types of movement: eight-day and one-day (30-hour) movements. A clock with an eight-day movement ...
In 1822 Jerome moved his business to Bristol, opening a small shop with his brother Noble, producing 30-hour and eight-day wooden clocks. The company installed the first circular saw ever seen in Bristol. By 1837 Jerome's company was selling more clocks than any of his competitors.
Their clocks date from 1724 and are highly prized. They produced mostly longcase clocks , the cheapest with 30-hour movements in modest oak cases, but they also made high quality eight-day movements with additional features such as indicating the high tide at Bristol docks .
The clock's movement is highly complex for the period, resembling a larger version of the then-current conventional movement. A coiled steel spring inside a brass mainspring barrel provides 30 hours of power. That is covered by the fusee barrel which pulls a chain wrapped around the conically shaped pulley known as the fusee.
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A fine marquetry 8-day longcase clock with quarter striking movement. Circa 1690-95. An exceptional gilt double basket top spring clock engraved in Spanish. The dial having a moon phase, age of the moon, day of the week with its astronomical symbol, and the date. With separate hour repeat and pull quarter repeat. Circa 1700-05.
Huygens' maintaining power in use. The weight drive used by Christiaan Huygens in his early clocks acts as a maintaining power. In this layout, the weight which drives the clock is carried on a pulley and the cord (or chain) supporting the weight is wrapped around the main driving wheel on one side and the rewinding wheel on the other.
The Seymour tall case clock in the White House, more commonly known as the Oval Office grandfather clock, is an 8-foot-10-inch (269 cm) longcase clock, made between 1795 and 1805 in Boston by John and Thomas Seymour, and has been located in the Oval Office since 1975. [1]
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