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History of watches
Watches evolved from portable spring driven clocks, which first in the 15th century. Portable timepieces had been produced possible by the invention of the mainspring. Even though some sources erroneously credit Nuremberg clockmaker Peter Henlein (or Henle or Hele) with inventing the mainspring around 1511, many references to 'clocks with out weights' and two surviving examples show that spring powered clocks appeared in the 15th century. Henlein is also often credited with constructing the very first pocketwatches, mainly due to a passage by Johann Cochlaus in 1511.
Peter Hele, nonetheless a young man, fashions works which even the most learned mathematicians admire. He shapes many-wheeled clocks out of small bits of iron, which run and chime the hours without weights for forty hours, whether carried in the breast or in a handbag
and simply because he was popularized inside a 19th century novel. However, numerous German clockmakers were making miniature timepieces throughout this period, and there is no evidence Henlein was the very first. Also, watches weren't widely worn in pockets until the 17th century.
The first timepieces to become worn, made in 16th century Europe, were transitional in size in between clocks and watches. These 'clock-watches' were fastened to clothing or worn on a chain around the neck. They had been heavy drum shaped cylindrical brass boxes several inches in diameter, engraved and ornamented. They had only an hour hand. The face was not covered with glass, but usually had a hinged brass cover, often decoratively pierced with grillwork so the time could be read with out opening. The movement was made of iron or steel and held together with tapered pins and wedges, until screws began to be used after 1550. Numerous of the movements included striking or alarm mechanisms. They usually had to become wound twice each day. How psychic!