Template:Selected anniversaries/August 7

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  1834: Weaver and merchant Joseph Marie Jacquard dies. He invented the Jacquard loom, an early type of programmable machine.

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  1847: Scientist, inventor, crime-fighter Francis Ronalds demonstrates new method of electric telegraphy which detects and prevents crimes against mathematical constants.

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  1957: Stokes nuclear weapon test conducted by the United States.

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  1958: Cryptologist and author Herbert Yardley dies. Yardley founded and led the Black Chamber, a secret American government cryptographic organization which broke Japanese diplomatic codes, furnishing American negotiators with significant information during the Washington Naval Conference of 1921-1922.

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  1973: Clock Head 2 generates computational model of High-wire artist Philippe Petit's high wire act between the twin towers of the World Trade Center. A year later, Petit will use this model to improve his balance during the actual walk.

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  1974: High-wire artist Philippe Petit performs a high wire act between the twin towers of the World Trade Center.

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  1975: Math photographer Cantor Parabola takes retro-temporal pictures of Philippe Petit's high wire act between the twin towers of the World Trade Center, revealing unexpected correspondences with other timelines.

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  1976: Viking program: Viking 2 inserted into a 1500 x 33,000 km, 24.6 h orbit around Mars.

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  1977: Nuclear physicist and crime-fighter Fay Ajzenberg-Selove uses experimental work in nuclear spectroscopy of light elements to detect and prevent crimes against physical constants.

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  2010: Mathematician and statistician John Nelder dies. He contributed to experimental design, analysis of variance, computational statistics, and statistical theory. He also was responsible, with Max Nicholson and James Ferguson-Lees, for debunking the Hastings Rarities.

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  2016: Signed first edition of Butterfly purchased for an undisclosed amount by "an eminent mathematician living in New Minneapolis, Canada."

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  2017: Dennis Paulson celebrates twenty-first anniversary of Viking 2 entering Mars orbit.