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Horology E
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| Ébauche |
Historically this French term meant an unfinished, raw
movement with just the main plate, the wheels, and the bridges. More
recently it has come to mean anything from a raw movement supplied
as a "parts kit" to an entire decorated, assembled, and
adjusted movement; often used in reference to manufacturers supplying
watch brands with completed movements upon which the latter then put
their names. |
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| Ébauche |
An incomplete watch movement most frequently purchased from specialized
suppliers by watch manufacturing brands. The ébauche is a raw
part that does not include any of the watch's regulating parts, nor
its dials and hands. |
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| Electric timepiece |
Include electric winding, electronically governed balance-wheel
or pendulum |
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| Electronic timepiece |
Clock and watch with solid-state (transistorized) control of the
power supply |
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| Equation of Time |
The difference between the clock time and the time defined
by the position of the sun. Because we divide the day into 24 equal
hours, true solar time differs slightly. |
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| Escapement |
This most important part of the watch movement serves a dual function:
- Makes sure the oscilIator keeps oscillating, whether in a pendulum
based clock or in a balance-wheel-based mechanical watch.
- Releases the power from the mainspring in very regulated increments
that control the motion of the hands and therefore the display
of the time.
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| Escape Wheel |
Driven by the gears in the power train, it regulates
the unwinding action of the mainspring and supplies power to the balance
wheel via the pallet fork in a lever escapement watch. |
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| Etablissage |
French term for the method of manufacturing watches
and/or movements by assembling their various components. It generally
includes the following operations: receipt, inspection and stocking
of the "e'bauche", the regulating elements and the other
parts of the movement and of the make-up; assembling; springing and
timing; fitting the dial and hands; casing; final inspection before
packing and dispatching. |
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| Etablisseur |
French term for a watch factory which is engaged only in assembling
watches, without itself producing the components, which it buys from
specialist suppliers. |
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