1845

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• With the help of a government loan Ferdinand Adolph Lange starts manufacturing watches with 15 apprentices on 7 December 1845 in Glashütte (Saxonia, Germany) and hereby founds the successful tradition of the Glashütte watch production.
• Experiments carried out in Paris by astronomer Laugier and watchmaker and Winnerl, establish the relationship between a pendulum's suspension spring and the isochronism of its oscillations.