On the isochronism of Galilei's horologium

Measuring the passage of time has always fascinated the humankind throughout the centuries. It is amazinghow the general architecture of clocks has remained almost unchanged in practice to date from the Middle Ages.However, the foremost mechanical developments in clock-making date from the seventeenth century, when thediscovery of the isochronism laws of pendular motion by Galilei and Huygens permitted a higher degree of accuracy inthe time measure.