A grandfather clock also a longcase clock , tall-case clock , grandfather's 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. The case often features elaborately carved ornamentation on the hood or bonnet , which surrounds and frames the dial, or clock face. The English clockmaker William Clement is credited with the development of this form in Until the early 20th century, pendulum clocks were the world's most accurate timekeeping technology, and longcase clocks, due to their superior accuracy, served as time standards for households and businesses.
How to Determine the Age of a Grandfather Clock
Determining the Value of a Grandfather Clock? | ThriftyFun
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29 Ways To Incorporate A Grandfather’s Clock Into Decor
A leap second is a one- second adjustment that is occasionally applied to Coordinated Universal Time UTC , to accommodate the difference between precise time as measured by atomic clocks and imprecise observed solar time known as UT1 and which varies due to irregularities and long-term slowdown in the Earth's rotation. The UTC time standard, widely used for international timekeeping and as the reference for civil time in most countries, uses precise atomic time and consequently would run ahead of observed solar time unless it is reset to UT1 as needed. The leap second facility exists to provide this adjustment. Because the Earth's rotation speed varies in response to climatic and geological events,  UTC leap seconds are irregularly spaced and unpredictable. This practice has proven disruptive, particularly in the twenty-first century and especially in services that depend on precise time stamping or time-critical process control.
This is part of the reason clocks make such superb collectibles. Antique and vintage clocks can whisk us back to the 18th and 19th centuries. But the art of clock-making goes way back, transcending continents and encompassing an entire range of design styles and technologies.