====== JLC 815 ======
{{wst>image_r|JLC 815|Calibre JLC 815\\ © [[Jaeger-LeCoultre]]}}

The **JLC 815** is the first [[automatic]] [[alarm]] movement from [[Jaeger-LeCoultre]].

Introduced in [[1956]] with the original [[Jaeger-LeCoultre Memovox]] (E 853), the Calibre 815 features a [[repeater]] alarm, the first in an automatic watch. This movement was later used in the [[Jaeger-LeCoultre Deep Sea Alarm]] (ref E 857) of [[1959]].

The JLC 815 spawned the similar **JLC 825** which adds a date window and was introduced with the Memovox (E 855) in [[1959]]. Production of Cal. 815 ended in [[1966]], while Cal. 825 was replaced in [[1969]] by [[JLC 916|Calibre 916]], which featured a free-rotating winding mass.

Unlike earlier automatic movements from Jaeger-LeCoultre, the 815/825 features a central sweep second hand. It is a [[bumper]] movement like earlier JLC Calibres, however, since the alarm function had to reach past the rotor to the case back.

Calibre 815 had 17 jewels and measured 14 [[ligne]] across. It beat at 18,000 A/h. It was a [[dual barrel]] movement, with one barrel providing about 45 hours of run time and the other providing 20 seconds of alarm sound.

===== Specifications =====
  * 14 [[ligne]]s in diameter
  * [[Glucydur]] balance, automatically compensating flat [[hairspring]]
  * 18,000 A/h
  * [[Double barrel]] (time and alarm)
    * Unidirectional [[bumper]] automatic winding for time
    * Manual winding for alarm
  * Direct sweep central seconds
  * 17 [[jewels]]
  * Alarm hammer inside case back


{{wst>template_jaeger-lecoultre_alarm_calibres}}

===== External links =====
  * [[http://jlc.watchprosite.com/show-forumpost/fi-2/pi-5969083/ti-875793/s-0/|An interesting page of JLC history: Automatic watches]]
  * [[http://www.qpmagazine.com/media/38963/Modern_Classics_Jaeger_LeCoultre_Memovox.pdf|Modern Classics: Jaeger-LeCoultre Memovox]]
  * [[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]]


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