Dutch mathematician, Christiaan Huygens, patented the pocket watch on this day in 1675.

Did you know that:

• William Griggs, the inventor of the photo-chromo lithography, was born on this day in 1832
• The first escalator was installed at London Underground at Earl’s Court Station on this day in 1911
• The patent for an antibiotic for typhoid was granted to Crooks, Rebstock, Controalis, and Bartz on this day in 1949