====== JLC 916 ======
**Calibre 916** (branded "Speedbeat") was an [[automatic]] [[alarm]] [[movement]] from [[Jaeger-LeCoultre]].

Introduced in [[1969]], Calibres 916 replaced [[JLC 815|Calibres 815 and 825]] in the [[Jaeger-LeCoultre Memovox]] range. This calibre went out of production in [[1978]] but was eventually replaced by [[JLC 919|Calibre 919]], introduced in [[1994]]. A total of 7,731 watches were produced with Calibre 916.

There were two notable features of Calibre 916 

  * It was the first Jaeger-LeCoultre alarm calibre to use a high-speed 28,800 A/h balance, giving improved precision.
  * It was the first ever automatic alarm watch with a free-rotating rotor, as opposed to the [[bumper]] movements produced previously.

As in other Jaeger-LeCoultre alarm calibres, the alarm hammer struck a protuberance on the back plate, making a distinctive buzzing sound. Even if the alarm was not wound, the hammer rattled freely against the protuberance. In Calibre 916, this protuberance fits through an extra-wide hole in the center of the rotor.

===== Variants =====
The Jaeger-LeCoultre Calibre 916 was used as an [[ebauche]] by [[Girard Perregaux]], becoming the [[GP 080]] Gyromatic alarm.

===== Specifications =====
  * 13 [[ligne]]s in diameter
  * [[Glucydur]] balance, automatically compensating flat [[hairspring]]
  * 28,800 A/h
  * [[Double barrel]] (time and alarm)
    * Bidirectional automatic winding for time
    * Manual winding for alarm
  * Direct sweep central seconds
  * 27 [[jewels]]
  * Alarm hammer inside case back


{{wst>template_jaeger-lecoultre_alarm_calibres}}

===== External Links =====
  * [[http://omegaforums.net/threads/a-little-potted-history-of-the-memovox-my-recently-acquired-cal-911.4480/|A Little Potted History Of The Memovox & My Recently Acquired Cal 911]]
  * [[http://www.adamvintage.com/jaeger-lecoultre-memovox.html|Three Cheers for Memovox!]]


{{tag>Movements Automatic_movements Jaeger-LeCoultre_calibres Jaeger-LeCoultre_Memovox_calibres Alarm_movements Automatic_alarm_movements}}