Dating a pocket watch dating someone who has been in jail
The oldest surviving wristwatch (then described as a bracelet watch) is one made in 1806 and given to Joséphine de Beauharnais.Wristwatches were first worn by military men towards the end of the 19th century, when the importance of synchronizing manoeuvres during war, without potentially revealing the plan to the enemy through signaling, was increasingly recognized.This innovation increased watches' accuracy enormously, reducing error from perhaps several hours per day resulting in the addition of the minute hand to the face from around 1680 in Britain and 1700 in France.The increased accuracy of the balance wheel focused attention on errors caused by other parts of the movement, igniting a two-century wave of watchmaking innovation. The verge escapement was replaced in quality watches by the cylinder escapement, invented by Thomas Tompion in 1695 and further developed by George Graham in the 1720s.The concept of the wristwatch goes back to the production of the very earliest watches in the 16th century.Elizabeth I of England received a wristwatch from Robert Dudley in 1571, described as an arm watch.
The British had predominated in watch manufacture for much of the 17th and 18th centuries, but maintained a system of production that was geared towards high quality products for the elite.During the First Boer War, the importance of coordinating troop movements and synchronizing attacks against the highly mobile Boer insurgents became paramount, and the use of wristwatches subsequently became widespread among the officer class.The company Mappin & Webb began production of their successful "campaign watch" for soldiers during the campaign at the Sudan in 1898 and accelerated production for the Second Boer War a few years later.Some watches use radio clock technology to regularly correct the time.Developments in the 2010s include smartwatches, which are elaborate computer-like electronic devices designed to be worn on a wrist.
The application of the spiral balance spring (spiral hairspring) for watches ushered in a new era of accuracy for portable timekeepers, similar to that which the pendulum had introduced for clocks.