1720 in science explained

The year 1720 in science and technology involved some significant events.

Astronomy

• February 10 – Edmond Halley is appointed as Astronomer Royal of England.

Medicine

• May – First patient admitted to the Westminster Public Infirmary, predecessor of St George's Hospital, London.
• Dr Steevens' Hospital is established at Kilmainham, Dublin.^[1]
• Great Plague of Marseille, the last major outbreak of bubonic plague in Europe.
• English physician Richard Mead publishes A Short Discourse concerning Pestilential Contagion, and the Method to be used to prevent it.

Physics

• Willem 's Gravesande publishes Physices elementa mathematica, experimentis confirmata, sive introductio ad philosophiam Newtonianam, an introduction to Newtonian physics, in Leiden.

Technology

• A theodolite is developed by Jonathan Sisson of England.
• Pinchbeck is invented by English watchmaker Christopher Pinchbeck; it is an alloy of 83% copper and 17% zinc, creating a strong, hard-wearing metal which has the appearance and weight of 20 carat gold.
• An early chronograph is invented which has only mechanical parts in it.
• Henry de Saumarez (of the Channel Islands) produces an instrument called the Marine Surveyor intended to measure a ship's velocity.^[2]
• A single-action five-pedal harp is developed by Jacob Hochbrucker of Bavaria which can raise the pitch of the selected strings by a half step.
• approx. date – Joseph Williamson uses a differential gear in a clock.

Births

• January 30 – Charles De Geer, Swedish industrialist and entomologist (died 1778)
• March 13 – Charles Bonnet, Genevan naturalist and philosophical writer (died 1793)
• July 18 – Gilbert White, English naturalist (died 1793)
• October 8  - Geneviève Thiroux d'Arconville, French novelist, translator and chemist (d. 1805)
• November 5 - Jean Baptiste Christophore Fusée Aublet, French pharmacist and botanist (died 1778)
• December ? – James Hargreaves, English inventor (died 1778)
• approx. date – Dmitry Ivanovich Vinogradov, Russian chemist and (died 1758)

Deaths

• December 29 – Maria Margarethe Kirch, German astronomer (born 1670)^[3]
• David Gregory, Scottish physician and inventor (born 1625)

Notes and References

1. Book: Kirkpatrick, Thomas Percy Claude. 1924. The History of Dr Steevens' Hospital, Dublin 1720–1920. Dublin University Press.
2. A. H. W.. Robinson. Forum. 358-40. Journal of Navigation. 9. 1956. 10.1017/S0373463300036493. free.
3. Web site: Maria Kirch - German astronomer. Encyclopedia Britannica. 5 April 2018. en.