Huygen’s patent for his pendulum clock

Huygens’s application for the patent of his pendulum clock is delivered to the authorities by Saloman Coster and remarkably two days later after the actual timepiece had been inspected by the States General of the United Netherlands.

Identification and attribution of Christiaan Huygens’ first pendulum clock

OR

Two days later Coster is awarded exclusive rights for 21 years and the patent is granted one month later on Jul 16.

THE INVENTION OF THE PENDULUM CLOCK PART 1/4 – The real story