DescriptionChristiaan Huygens Clock and Horologii Oscillatorii.jpg
English: One of the first
pendulum clocks designed by
Christiaan Huygens, and his treatise on the pendulum, Horologium Oscillatorium published in 1673, on display in
Museum Boerhaave in
Leiden,
Netherlands. This may be Huygens's second pendulum clock, which was also finished in 1673 and is shown on the open page of the book. In it, Huygens demonstrated how to make the swing of the pendulum isochronous using "cycloidal" cheeks of metal (shown on page) to confine the suspension cord and give the pendulum a cycloidal trajectory. Huygens claimed an accuracy of 10 seconds per day.
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{{Information |Description={{en|1=Christiaan Huygens: Clock and Horologii Oscillatorii at display in Museum Boerhaave in Leiden - Netherlands}} |Source=http://www.flickr.com/photos/koopmanrob/3775343287/sizes/o/ |Author=Rob Koopman ([http://www.flickr.com
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