Search results
Results from the WOW.Com Content Network
The Graham or deadbeat escapement was an improvement of the anchor escapement first made by Thomas Tompion to a design by Richard Towneley in 1675, [38] [39] [40] although it is often credited to Tompion's successor George Graham who popularized it in 1715. [41]
Anchor escapement clocks driven by a mainspring required a fusee to even out the force of the mainspring. It is a recoil escapement as mentioned above; the momentum of the pendulum pushes the escape wheel backward during part of the cycle. This causes extra wear to the movement, and applies varying force to the pendulum, causing inaccuracy.
George Graham. George Graham, FRS (7 July 1673, maybe 1675 [1] – 16 November 1751) was an English clockmaker, inventor, and geophysicist, and a Fellow of the Royal Society. He was born in Kirklinton, Cumberland. [2] A Friend (Quaker) like his mentor Thomas Tompion, Graham left Cumberland in 1688 for London to work with Tompion. He later ...
The deadbeat escapement, widely introduced by clockmaker, George Graham, around 1715, was significantly more accurate than the anchor and in the 19th century became the standard escapement used in quality pendulum clocks. Flamsteed wrote often to Towneley about the clocks, which were made to run for a year between windings.
Johann Mannhardt (1798–1878), German maker of turret clocks, Munich, Mannhardt-Escapement, turret clock Münchner Frauenkirche. Joseph Saxton (1799–1873), American clockmaker, inventor and instrument maker, Philadelphia. Joseph Thaddäus Winnerl (1799–1886), Austrian watchmaker, Paris, marine chronometer.
Grasshopper escapement, 1820. The grasshopper escapement is a low-friction escapement for pendulum clocks invented by British clockmaker John Harrison around 1722. An escapement, part of every mechanical clock, is the mechanism that gives the clock's pendulum periodic pushes to keep it swinging, and each swing releases the clock's gears to move forward by a fixed amount, thus moving the hands ...
Thomas attended the same school and, when 14 or 15, was sent to London to be apprenticed to George Graham, a clock and watch maker who had trained under Thomas Tompion. Graham’s business was situated in Water Lane, Fleet Street. When Mudge qualified as a watchmaker in 1738 he began to be employed by a number of important London retailers.
Around the same time as Harrison invented the grasshopper, George Graham introduced the deadbeat escapement, invented by Richard Towneley in 1675, which allowed the pendulum to swing virtually undisturbed during most of its cycle. This accurate escapement became the standard in precision regulator clocks.