going barrel

A safety pinion was an alternate means of protection, used with the going barrel.

He also invented the floating mainspring going barrel.

The built-in tension of the spring in the going barrel makes it hazardous to disassemble even when not wound up.

Hanging Barrel: a version of the going barrel that to save space is supported by the movement only at its upper end.

In spring-driven clocks, the mainspring can be coiled inside a cylindrical drum called a going barrel.

In the motor barrel, the functions of the arbor and barrel were reversed from the going barrel.

In the 1780s, pursuing thinner watches, French watchmakers adopted the going barrel with the cylinder escapement.

Keywind watches are also commonly seen with conventional going barrels and other types of mainspring barrels, particularly in American watchmaking.

In old spring-driven clocks, dating from before the invention of the going barrel, a maintaining power spring kept the clock running while the mainspring was being wound.

In 1760, Jean-Antoine Lépine dispensed with the fusee, inventing a going barrel to power the watch gear train directly.

Going barrel: the form used in modern watches, is wound by turning the arbor and drives the watch movement by a ring of teeth around the barrel.

As mentioned, the movement has no fusee which equalizes the driving power transmitted to the train, replaced instead by a going barrel to drive the train directly.

By 1850, the Swiss and American watchmaking industries employed the going barrel exclusively, aided by new methods of adjusting the balance spring so that it was isochronous.

Around 1900, when broken watchsprings were more of a problem, some pocketwatches used a variation of the going barrel called the motor barrel or safety barrel.

Fusee chain-driven timing was replaced with a mainspring of better quality spring steel (commonly known as the "going barrel") allowing for a more even release of power to the escape mechanism.

They were used in most spring driven clocks and watches from their first appearance until the 19th century when the going barrel took over, and in marine chronometers until the 1970s.

The going barrel invented in 1760 by Jean-Antoine Lépine provided a more constant drive force over the watch's running period, and its adoption in the 19th century made the fusee obsolete.

In the form used in modern watches, called the going barrel, the mainspring is coiled around an arbor and enclosed inside a cylindrical box called the barrel which is free to turn.

This resulted in the invention of the stackfreed and the fusee in the 15th century, and many other innovations, down to the invention of the modern going barrel in 1760.

The modern going barrel, invented in 1760 by Jean-Antoine Lépine, produces a constant force by simply using a longer mainspring than needed, and coiling it under tension in the barrel.

Motor or safety barrel: used in pocketwatches around 1900, a reverse variant of the going barrel in which the spring is wound by turning the barrel, and turns the watch movement by the central arbor.

The motive power is typically with a spring and, in Britain Fusee, or, in France, a Going Barrel although weight-driven clocks were made in these small sizes with durations up to a month usually with two weights wound around the same barrel.