According to Polhem's autobiography, the event that marked the beginning of his career was the successful repair of the unfinished medieval (16th century) astronomical clock by Petrus Astronomus at Uppsala Cathedral, which had remained unfinished and broken for more than a century.
He had an impact on her and was an inspiration to her as a follower of Christopher Polhem.
These measure not only ended much more expensive than intended but also proved completely insufficient, and as the decay had obviously made the old lock impossible to repair properly, Christopher Polhem (1661–1751), "the father of Swedish mechanics", was consulted for a new construction.
Christopher Polhem of Sweden later reinvented it, giving rise to the name Polhemsknut in Swedish.
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