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2. Oval Office grandfather clock - Wikipedia

   en.wikipedia.org/wiki/Oval_Office_grandfather_clock

   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]

3. Simon Willard - Wikipedia

   en.wikipedia.org/wiki/Simon_Willard

   The farm, now operated as the Willard House and Clock Museum, had been built in 1718 by the Willards' third American generation. When Simon Willard was born, the house had just one room. The elder brother, Benjamin, who was 10 years older than Simon, learned horology and opened a workshop adjacent to the house in 1766. It is presumed that the ...

4. Lighthouse clock - Wikipedia

   en.wikipedia.org/wiki/Lighthouse_Clock

   A c. 1825–30 lighthouse timepiece by Simon Willard. A lighthouse clock is a type of mantel clock manufactured in the U.S. from 1818 through 1830s by the American clockmaker Simon Willard, having the dial and works exposed beneath a glass dome on a tapered, cylindrical body.

5. Electric clock - Wikipedia

   en.wikipedia.org/wiki/Electric_clock

   These keep time by counting the oscillations of a calibrated tuning fork with a specific frequency. These were only made in battery-powered form. Battery-powered clocks have been made using the schemes above with the obvious exception of a synchronous movement. All battery-powered clocks have been largely replaced by the lower cost quartz movement.

6. Pendulum clock - Wikipedia

   en.wikipedia.org/wiki/Pendulum_clock

   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.

7. Quartz clock - Wikipedia

   en.wikipedia.org/wiki/Quartz_clock

   Developing quartz clocks for the consumer market took place during the 1960s. One of the first successes was a portable quartz clock called the Seiko Crystal Chronometer QC-951. This portable clock was used as a backup timer for marathon events in the 1964 Summer Olympics in Tokyo. [46]