Some can be adjusted with a screwdriver, while others require a key for adjustment.

It is found in Swiss and French club-toothed escape wheel systems. Then, draw thick lines extending outward.

RACK STRIKING. An inner semi-circle is marked in quarter hours.

Modern watches use synthetic jewels.

- A type of lever escapement that uses a second roller for guard action. These pins were also used to create decorative patterns.

- A cam shaped like a heart used in a chronograph that causes the chronograph hand to return to zero. - This wheel is the last one in the going train, which allows the escape of the energy causing motion to the balance.

SET-UP. A new slide was patented in 1755 by Joseph Bosley that had no wheel (the segmental rack). - The curves found at each end of a helical or cylindrical balance spring.

Also called suspension elastique. PIROUETTE.

- A model of watch case with rounded, smooth edges. See table roller and crank lever escapement. Illustration of engraved, open, line - 82006974

CYLINDER ESCAPEMENT.

It is similar to a cylinder escapement in that it is a frictional rest escapement.

ARC.

The going train deals with timekeeping, while the striking train deals with marking the hours. - This wheel controls the number of hours struck.

- A balance spring without curb pins. HEART PIECE.

It gets its name from the shape of the teeth on the escape wheel.

The dial is numbered from I to XII. Pair-cases were also used widely on the continent during the earlier period. - Blue pomme hands used on watches by Abraham Louis Breguet. Double watch and angel come together to create a unique watch design.

- Watch regulation has changed greatly over the years. - A thick flexible hair or bristle commonly found in early German watches.

FLY. This outlines the face of the watch. - The wheel located on the going barrel; the first wheel in the train. See engine turning. - Associated with the Geneva stop-work; a wheel in the shape of a Maltese cross that forms part of a stop-work. - A watch designed to repeat the quarters and hours when the wearer presses a push-piece or moves a slide-piece. It’s creative, unusual and gorgeous. Model: 110 BLK/POUCH .

RECOIL ESCAPEMENT. - Also known as a perpetual watch.

- Used to maintain marine chronometers in a horizontal position no matter how the ship moves. Both names come from the shape of the part that gets the impulse, which looks rather like a comma.

- A single beat escapement introduced in the 1700s by a French watchmaker named Robin. The bristle would be flexed by two pins on the rim of the balance. - The barrel contains the mainspring which when wound gives its energy out to the drive train, controlled by a toothed section on the exterior. Balance springs are protected from the problems associated with changes in temperature by the use of bi-metallic strips. The issue is further complicated by the popular painted enamel dials made in Geneva were frequently used on genuine English watches, as well as Swiss movements being placed in English cases in Holland.

This type of watch was an inexpensive version of a repeater. - The opening in the fork end of the lever escapement in which the impulse pin enters. A great sleeve design that has many elements including angel wings.

Utilizes two independent concentric rings that turn freely around their axes. - The first successful cheap watches were produced by G. T. Roskopf in 1867. Near the end of this time period, plain outer cases were more common. - A finger on the rack-striking mechanism that makes one revolution for every stroke of the hour. Insert the case blade under the lip of a snap-back vintage pocket watch and pry it open.

Related to remontoire. - The movement of the lever in a lever escapement towards the banking pins once the tooth has provided impulse to the pallet. - Also known as a balance spring. SOUSCRIPTION (MONTRE A). The top of the fusee has a stop fitted, so when the chain reaches the last groove, a lever is lifted against a cam that stops the mechanism. CLUB-FOOT VERGE. The cylinder stops the teeth as they cross paths.

The balance is never free of the escapement in these designs. The back plate in a clock is the one located furthest from the dial. This system replaced the ratchet wheel system to set the mainspring and regulate the rate of the watch.

- An early type of watch case, shaped like a drum.

Most likely made by John Arnold in 1764, but it didn’t get a lot of use for many years. - Popular in the late 1600s and early 1700s, the dial has a sun on one half and a moon on the other. FOUR-COLOURED GOLD. The verge carries two pallets. CLUB-TOOTHED LEVER. These watches were very popular in Switzerland and France during the early 1800s. Usually made of brass, even in good quality gold watches from the continent. TOMPION REGULATOR. When it enters the notch, it unlocks the escape wheel. FIVE-MINUTE REPEATER.

- Commonly known as a Bi-Metalic strip, invented by John Harrison, it composes of two different materials sandwiched together, each strip having a different co-efficiency of expansion which has the effect of countering any expansion or contraction due to changes in temperature. - Also known as bouchon. COUNT WHEEL. The pins are attached to the index, or regulator.

A watch with this type of balance will only be truly accurate in its rate for two temperatures. By 1600, they were replaced by a plain balance or two arm ring. Before the comb was developed, a set of bells was used to produce the music. Lever escapements were divided into the English version, which had pointed teeth on the escape wheel, and the Swiss or continental version, with club teeth. This gives a cushioning effect to the staff pivots in case the watch is dropped. - Part of a lever escapement.