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Pocket-Watch

The first pocket watch was created in Germany by Peter Henlein in 1524. Others appears in 1548 and more were produced in Switzerland and England after 1575. At this time the main problem was the driving mechanism. Typically, weights were used, which made portable watches impractical, but it was a period of great advancement and innovation. The first movements were made of steel, then later brass. They had no balance springs and were notoriously inaccurate. The watches had only an hour hand and had to be wound twice daily. Soon the spiral leaf mainspring appeared, the greatest innovation at the time as it allowed long-term power without weights. Because of a difference in timing between the long arcs and the short arcs, accuracy could only be improved by using a limited portion of the mainspring. Germany produced a watch with a cam at the end of a barrel arbor to compensate for variations in spring tension, but it was the English and French solution to use the fusee. This stopped the watch during winding to prevent over oscillation of the balance wheel. Additional stops were included as regulators.
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pocket watch
ID: HP-014255
pocket watch
ID: HP-014256
pocket watch
ID: HP-014261
pocket watch
ID: HP-014262
pocket watch
ID: HP-014264
pocket watch
ID: HP-014266
pocket watch
ID: HP-014268
pocket watch
ID: HP-014270
pocket watch
ID: HP-014271
pocket watch
ID: HP-014273
pocket watch
ID: HP-014275
pocket watch
ID: HP-014276
pocket watch
ID: HP-014278
pocket watch
ID: HP-014279
pocket watch
ID: HP-014281
pocket watch
ID: HP-014282
pocket watch
ID: HP-014284
pocket watch
ID: HP-014285
pocket watch
ID: HP-014286
pocket watch
ID: HP-014288

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