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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.
Gravity escapements were used in tower clocks. By the end of the 19th century specialized escapements were used in the most accurate clocks, called astronomical regulators, which were employed in naval observatories and for scientific research. The Riefler escapement, used in Clemens-Riefler regulator clocks was accurate to 10 milliseconds per day.
Sigmund worked mainly on new developments in the area of drawing instruments and precision clocks, while his brothers handled the technical, sales and management of the company. In 1878 he settled in Munich, to be in contact with the local scientific community. [4] He invented the Riefler escapement which was patented in 1889. [5]
The Ottoman engineer Taqi ad-Din described a weight-driven clock with a verge-and-foliot escapement, a striking train of gears, an alarm, and a representation of the Moon's phases in his book The Brightest Stars for the Construction of Mechanical Clocks (Al-Kawākib al-durriyya fī wadh' al-bankāmat al-dawriyya), written around 1565. [119]
The escapement was never mass produced, and no examples are known to exist. It might be relevent to the Sigmund Reifler biographical article but not here, as the watch escapement was necessarily different from his pendulum clock escapement. There is a more important problem with this article. Riefler invented two pendulum clock escapements.
Original drawing (c. 1637) of Galileo's pendulum clock and escapement. Galileo's escapement is a design for a clock escapement, invented around 1637 by Italian scientist Galileo Galilei. It was the earliest design of a pendulum clock. Since he was blind by then, Galileo described the device to his son, who drew a sketch of it. The son began ...
the first has somehow, in some way, been my best year yet. So, as I often say to participants in the workshop, “If a school teacher from Nebraska can do it, so can you!”
As clocks were made smaller, first as bracket clocks and lantern clocks and then as the first large watches after 1500, balance wheels began to be used in place of foliots. [8] Since more of its weight is located on the rim away from the axis, a balance wheel could have a larger moment of inertia than a foliot of the same size, and keep better ...