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Battery Electric Clock movements

Displayed by Bill Turner, Ted Negus and Jan Wright

 
Various battery clocks
68-01		 82aa.htm
82aa		 Diehl Electro 7 Jewel motor wind
82ab		 Kienzle 606c magnet wind
82ac		 Junghans W285
82ad
Japanese magnet wind
82ae		 Japanese motor wind
82af		 Japanese motor wind with pendulum
82ag		 Scottish transistor controlled
82ah		 Scottish transistor controlled
82ai
Swiss 21 jewel motor wind
82aj		 anon.
82ak		 Scottish
82al		 West German transistor controlled.
82am		 West German transistor controlled.
82an
anon.
82ao		 82ap.htm
82ap		 82aq.htm
82aq		 82ar.htm
82ar		 82as.htm
82as
82at.htm
82at		 82au.htm
82au		 82av.htm
82av		 82aw.htm
82aw		 Smiths mk1
82ax
Smiths mk 2
82ay		 Junghans 7 jewel. German.
82az		 Smiths mk3
82ba		 French with mechanical contacts.
82bb		 Russian
82bc
East Germany (GDR)
82bd		 anon.
82be		 Kienzle 627C. Germany
82bf		 French 5 jewel
82bg		 Slave dial
94-05
Slave dial
94-06		 Slave dial
94-07		 Slave dial
94-08		 Slave dial
94-09		 Slave dial
94-10
Slave dial
94-11		 94-12.htm
94-12		 Slave dial
94-13		 Slave dial
94-14		 Slave dial
94-15
Slave dial
94-16		 Slave dial
94-17		 Mass produced battery clock movements, circa 1960 - 1970 Before the advent of the common battery quartz clock many other methods were employed to give a relatively cheap method of electrical timekeeping. These varied from simply modifying a spring driven movement by arranging for it to be wound by battery power, to using magnetism to drive a balance wheel, then, using it as a motor to drive the hands. There were many elaborate and complicated variations, possibly one of the most eccentric being the Diehl Electron where a transistor circuit drives a tiny motor at a fixed speed which magnetically interacts with the powered balance (also transistor driven) to correct each other, and improve the timekeeping, (early phase locked loop). The final development was probably the Tuning fork movement, where a tuning fork vibrates at a relatively high frequency, magnetically rotating a disc which is geared to the hands. This is exactly the same principle as the quartz clock, where a piece of crystal is vibrated electrically (over 32,000 times a second!) and the resulting vibrations are electronically divided down to obtain 1 pulse every second to drive the tiny stepper motor, which turns the hands.
DSCF0416		 A selection of battery clocks from the 1960s and later
68 - Battery Clocks		 A working display of various models of slave dial movements
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