Timeline November 1761

Events in November 1761 4

• 1706 – 1761 John Dollond (1706-1761) Died 30 November 1761, aged 55 English optician who patented the achromatic lens, which combines crown and flint glass to remove colour fringing. The design greatly improved telescopes. In the year of his death he was made optician to George III.
• 1706 – 1761 John Dollond (1706-1761) Died 30 November 1761, aged 55 English optician who patented the achromatic lens, which combines crown and flint glass to remove colour fringing. The design greatly improved telescopes. In the year of his death he was made optician to George III.
• 1761 Harrison's H4 marine chronometer sails for Jamaica The decisive sea trial of a longitude watch begins William Harrison sailed from Portsmouth aboard HMS Deptford with his father John Harrison's H4 watch to test it on the voyage to Jamaica. On arrival the watch had lost only about five seconds. The trial showed that longitude could be found at sea with a timekeeper.
• 1761 Harrison's H4 marine chronometer sails for Jamaica The decisive sea trial of a longitude watch begins William Harrison sailed from Portsmouth aboard HMS Deptford with his father John Harrison's H4 watch to test it on the voyage to Jamaica. On arrival the watch had lost only about five seconds. The trial showed that longitude could be found at sea with a timekeeper.