Births on April 22

Harold Jeffreys

Born on April 22, 1891

Harold Jeffreys, English mathematician, geophysicist, and astronomer (d. 1989)

Sir Harold Jeffreys, FRS (22 April 1891 – 18 March 1989) was a British mathematician, statistician, geophysicist, and astronomer. His book, Theory of Probability, which was first published in 1939, played an important role in the revival of the objective Bayesian view of probability.

References

Harold Jeffreys

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Events on 1891

10 Mar

Strowger switch
Almon Strowger, an undertaker in Topeka, Kansas, patents the Strowger switch, a device which led to the automation of telephone circuit switching.
15 May

Rerum novarum
Pope Leo XIII defends workers' rights and property rights in the encyclical Rerum novarum, the beginning of modern Catholic social teaching.
20 May

Kinetoscope
History of cinema: The first public display of Thomas Edison's prototype kinetoscope.

Births on April 22

Harold Jeffreys

Born on April 22, 1891

References

Choose Another Date

Events on 1891

Strowger switch

Rerum novarum

Kinetoscope