Elgin pocket watch dating
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An additional dial is there to record the number of revolutions or minutes counted by the second hand. The English watchmakers, for instance, consider a chronometer to be a portable clock or watch with a detent escapement, although they used the term before detent escapements were developed.
Most watches are also calibrated to maintain a constant time as the main spring is winding down. - This is used in better quality repeating watches and ensures that the hour striking mechanism is only struck when a push-piece is pushed fully home.Some use the term to also describe an instrument used to test watches during repair work. - A lever or pawl with a beak-like shape to engage the ratchet-shaped teeth on a wheel.This lever can be pivoted, and is under tension by a spring.- The term "adjusted" simply means that the watch has been calibrated and keeps time under various conditions.These conditions could be temperature, meaning that for any temperature the watch will maintain accurate time.This example is from a Zenith HS3 pocket watch issued to the Royal Navy's Hydrographic Service during the Second World War.
It is apparently based on a movement used in pocket watches issued to the Royal Flying Corps during the First World War (see below).
The manufacturer's name or logo is often stamped on the barrel-bridge, train-bridge, or on the ratchet.
Very often, the logo or symbol is stamped in the recess beneath the balance wheel.
The way the balance cock is formed can be very useful in dating a watch. - Also known as timing screws, these screws are adjusted to set the time. - Similar to a cock, but a bar has a foot which secures it to the movement plate. The pins embrace the end of a straight balance spring, and the slide moves along a keyed endless screw. Always paired with hole jewels to give less friction and better performance. - A movement covered with a cap to protect it from dust. Some watches don’t have the minutes marked, only the half and quarter hours. - Engraving on the front of a piece of metal that creates a relief effect by creating grooves, furrows, indentations and channels. - A chain designed to hold a lady’s watch or jewelry. Jacot in 1830, this was a duplex escapement most frequently used in watches exported to China.
The movement plate is engraved with an index to show how much the slide can be moved with the key. - A metal plate that holds the movement parts and bridges. - An improvement made to balance springs by using a flat spiral spring with an overcoil, developed by Abraham Louis Breguet, a Swiss horologist who worked in Paris, France. - Blue pomme hands used on watches by Abraham Louis Breguet. In the case of a watch, it was common to also attach the winding key and other trinkets for adornment. There is a double set of locking teeth to control the movement.
This movement was used by the Trafalgar Watch Company from the UK in watches with Swiss-made cases.: Soviet made, 19 jewels, manual wind, chronograph, circa late 1970's.