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Watch Words

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The following pages are a glossary of terms associated with horology, watches and watchmaking. Please click on one of the links or glossary terms below to learn more about them. Most of the terms are enhanced with detailed imagery. If you would like us to list any other words that you think may be helpful, please contact me direct chris@christopherward.co.uk. We will update the glossary frequently.

 

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E – WATCH WORDS

 

Ébauche

Incomplete (jeweled or non-jeweled) watch movement without regulating organs, mainspring, dial and hands. It is also known as a blanc roulant.

 

 

Eco-Drive

A name for a patented power mechanism found on some Citizen watches. This mechanism uses ordinary light to keep a rechargeable battery powered for watch operation. This technology is very sophisticated allowing some watch models to remain powered for up to 5 years in the dark. Watches with Eco-Drive technology will never need to have the battery replaced.

 

 

Elapsed Time Rotating Bezel

A graduated rotating bezel used to keep track of elapsed time. The bezel can be turned so the wearer can align the zero on the bezel with the watch's seconds or minutes hand. After a period of time passes, you can read the elapsed time off the bezel. This saves you having to perform the subtraction that would be necessary if you used the watch's regular dial.

 

 

Electroplating Process

Process of covering metal articles with a film of other metals. The article is immersed in a chemical solution; electric current (D.C.) flows through the solution from a piece of metal (anode) to the article (cathode), depositing metal thereon by electrolysis. See also PVD.

 

 

Endstone

Undrilled jewel, placed on the balance jewel with the tip of the balance-staff pivot resting against its flat surface, to reduce pivot friction. Sometimes used also for pallet staffs and escape wheels.

 

 

Engine-Turned

A surface decoration usually applied to the dial and the rotor using a grooving tool with a sharp tip, such as a rose engine, to cut an even pattern onto a level surface.

 

 

Equation of Time

Indication of the difference, expressed in minutes, between conventional mean time and real solar time. This difference varies from -16 to +16 seconds between one day and the other.

 

 

Escapement

A mechanism that is fitted between the gears and the regulating organ. The combination of the balance, balance spring, pallets and escape wheel, a subgroup which divides the impulses coming from the spring barrel into small, accurately proportioned doses. It guarantees that the gear train runs smoothly and efficiently.

 

 

Escape Wheel

A wheel belonging to the escapement mechanism.

Below: An example of an escape wheel used in a lever escapement. The escape wheel is locked alternatively against the entry and exit pallets.

 

Lever Escapement

 

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