I recently found in salvage a couple of 1960's tuning fork escapement battery movements.
Although technically as obsolete as a crown-wheel escapement, none-the-less they are an interesting part of the development of electrical horology.
Both examples employ the magnetic escapement said to have been devised ca 1941 by Straumann and perfected by Clifford. This according to Britten's Watch and Clock Dictionary and Guide. (sixteenth edition page 206)
For your perusal I have photographs of an early JECO and the Junghans-Diehl versions.
(click on the highlighted brand names)
I believe there was a much simplified version of the JECO named the "JECHRON" movement.
Both the JECO and Junghans tuning fork movements use a simple one transistor electronic circuit to drive and control the vibration of the tuning fork. The Junghans movement is self starting and has a device to prevent it from starting backward. The JECO, marked "Made for Seth Thomas" has a manual starting lever.
Don't laugh, they hum right along and there's no ratchet wheel such as in the Bulova Accutron.
Les
Although technically as obsolete as a crown-wheel escapement, none-the-less they are an interesting part of the development of electrical horology.
Both examples employ the magnetic escapement said to have been devised ca 1941 by Straumann and perfected by Clifford. This according to Britten's Watch and Clock Dictionary and Guide. (sixteenth edition page 206)
For your perusal I have photographs of an early JECO and the Junghans-Diehl versions.
(click on the highlighted brand names)
I believe there was a much simplified version of the JECO named the "JECHRON" movement.
Both the JECO and Junghans tuning fork movements use a simple one transistor electronic circuit to drive and control the vibration of the tuning fork. The Junghans movement is self starting and has a device to prevent it from starting backward. The JECO, marked "Made for Seth Thomas" has a manual starting lever.
Don't laugh, they hum right along and there's no ratchet wheel such as in the Bulova Accutron.
Les
