====== Regulator ======
The **regulator** (or **regulator arm**) is part of a wristwatch [[movement]]. It is a pointer that is attached to the [[balance cock]]. By moving the pointer towards "+" or "-" (or "A" or "R") the [[balance spring]] is shortened or extended by a minimum amount. As a result, the [[rate]] of the watch is speeded up or slowed down.

===== Regulator Types =====

==== Bosley Regulator ====
Invented and patented in [[1755]] by Joseph Bosley. From his invention almost every later regulator design that followed is derived.

==== Reed's Whiplash Regulator ====
{{wst>image_cl|Lange|L931.3|[[A. Lange & Söhne]] calibre [[Lange L931.3|L931.3]] with **Swan's neck fine regulation**|250px}}

In [[1867]] the American George P. Reed invented and patented an improvement to the Bosley regulator, US patent No. 61,867, dated February 5, 1867. 

Today this adjuster type is mostly called **swan's neck regulator** or **swan neck device**, because of the shape of the curved spring which is vaguely in the shape of a swan's neck.

See also 

  * [[Movement]]
  * [[Regulation]]
  * [[Precision adjustment]]
  * [[Swan's neck fine regulation]]
  * [[Triovis regulator]]

Please note that the term [[Regulator watch]] is a different use of the word "regulator".

{{tag>Terms}}