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The Riefler escapement is a mechanical escapement for precision pendulum clocks invented and patented [1] by German instrument maker Sigmund Riefler in 1889. [2] It was used in the astronomical regulator clocks made by his German firm Clemens Riefler from 1890 to 1965, [3] which were perhaps the most accurate all-mechanical pendulum clocks made.
A steam clock is a clock which is fully or partially powered by a steam engine. Only a few functioning steam clocks exist, most designed and built by Canadian horologist Raymond Saunders for display in urban public spaces. Steam clocks built by Saunders are located in Otaru, Japan; Indianapolis, United States; and the Canadian cities of ...
Indiana Steam Clock Coordinates: 39°46′09″N 86°10′10″W / 39.7692°N 86.1695°W / 39.7692; -86 The Indiana Steam Clock is a steam clock installed outside the Indiana State Museum , in Indianapolis , Indiana.
Raymond Saunders (Feb. 7, 1940 to Nov. 23, 2024) was a Canadian clockmaker who has designed and built more than 150 customized clocks that mainly serve as tourist-attracting public artworks. In 1977 he was commissioned to build a steam clock for the Gastown district of Vancouver , Canada. [ 1 ]
The second hand is driven by an electrical motor independent of the master clock. It takes only about 58.5 seconds to circle the face; then the hand pauses briefly at the top of the clock. It starts a new rotation as soon as it receives the next minute impulse from the master clock. [3]
The foliot was a horizontal bar with weights near its ends affixed to a vertical bar called the verge which was suspended free to rotate. The verge escapement caused the foliot to oscillate back and forth about its vertical axis. [12] The rate of the clock could be adjusted by moving the weights in or out on the foliot.
It has since been set backward 8 times and forward 18 times. The farthest time from midnight was 17 minutes in 1991, and the nearest is 89 seconds, set in January 2025. [5] The Clock was moved to 150 seconds (2 minutes, 30 seconds) in 2017, then forward to 2 minutes to midnight in 2018, and left unchanged in 2019. [6]
A play clock, also called a delay-of-game timer, is a countdown clock intended to speed up the pace of the game in gridiron football.The offensive team must put the ball in play by either snapping the ball during a scrimmage down or kicking the ball during a free kick down before the time expires, or else they will be assessed a 5-yard delay of game (American football) or time count violation ...