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The first man-made diffraction grating was invented around 1785 in Philadelphia by David Rittenhouse who strung 50 hairs between two finely threaded screws with an approximate spacing of about 100 lines per inch. [28] 1787 Automatic flour mill. Classical mill designs were generally powered by water or air.
The year 1787 in science and technology involved some significant events. Astronomy. January 11 – William Herschel discovers Titania and Oberon, ...
Events from the year 1787 in the United States. The United States Constitution was written and the ratification process began. Incumbents. Confederal government
Joseph Ritter von Fraunhofer (/ ˈ f r aʊ n ˌ h oʊ f ər /; German: [ˈfraʊnˌhoːfɐ]; 6 March 1787 – 7 June 1826 [1]) was a German physicist and optical lens manufacturer. He made optical glass, an achromatic telescope, and objective lenses. He developed diffraction grating and also invented the spectroscope.
The first American alarm clock was created in 1787 by Levi Hutchins in Concord, New Hampshire. This device he made only for himself, however, and it only rang at 4 am, in order to wake him for his job. [11] The French inventor Antoine Redier was the first to patent an adjustable mechanical alarm clock, in 1847. [12]
1787 (MDCCLXXXVII) was a common year starting on Monday of the Gregorian calendar and a common year starting on Friday of the Julian calendar, the 1787th year of the Common Era (CE) and Anno Domini (AD) designations, the 787th year of the 2nd millennium, the 87th year of the 18th century, and the 8th year of the 1780s decade. As of the start of ...
In 1787 Hutchins created the first American alarm clock. It was housed in a 29-by-14-inch (74 cm × 36 cm) wooden cabinet with mirrored doors, and had an extra gear that rang an attached bell at 4 a.m. [3] On February 23, 1789, Levi married Phoebe Hanaford, with whom he had ten children.
Jacques Alexandre César Charles (12 November 1746 – 7 April 1823) was a French inventor, scientist, mathematician, and balloonist.Charles wrote almost nothing about mathematics, and most of what has been credited to him was due to mistaking him with another Jacques Charles (sometimes called Charles the Geometer [1]), also a member of the Paris Academy of Sciences, entering on 12 May 1785.