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Spirograph is a geometric drawing device that produces mathematical roulette curves of the variety technically known as hypotrochoids and epitrochoids. The well-known toy version was developed by British engineer Denys Fisher and first sold in 1965.
Between 1962 and 1964 he developed various drawing machines from Meccano pieces, eventually producing a prototype Spirograph. Patented in 16 countries, it went on sale in Schofields department store in Leeds in 1965. A year later, Fisher licensed Spirograph to Kenner Products in the United States. In 1967 Spirograph was chosen as the UK Toy of ...
1989 – Tim Berners-Lee and Robert Cailliau build the prototype system which became the World Wide Web at CERN. 1989 – WordPerfect 5.1 word processing software released. [36] 1989 – Lotus Notes software is launched. [44] 1990 – Archie, the world’s first search engine, was released. [45] 1990 – Adobe Photoshop is released.
This article cites its sources but its page reference ranges are too broad or incorrect. Please help in adding a more precise page range. (July 2024) (Learn how and when to remove this message) Survey of eight prominent scripts (left to right, top to bottom): Sumerian cuneiform, Egyptian hieroglyphs, Chinese characters, Maya script, Devanagari, Latin alphabet, Arabic alphabet, Braille Part of ...
The TCRWP has published Units of Study in Writing for Grades K-8, Units of Study in Reading for Grades K-8, and Units of Study in Phonics for Grades K-1. The Units of Study curriculum guide books and "workshop" model centers on independent student work in combination with teacher modeling and one-on-one and small-group guidance.
From ancient history to the modern day, the clitoris has been discredited, dismissed and deleted -- and women's pleasure has often been left out of the conversation entirely. Now, an underground art movement led by artist Sophia Wallace is emerging across the globe to challenge the lies, question the myths and rewrite the rules around sex and the female body.
Among his other patents were the parabolagraph, the spirograph, the electric bell used in trains, and an electric arc lamp of his own design. [5] Abakanowicz published several works, including works on statistics , integrators and numerous popular scientific works, such as one describing his integraph .
The Indus Valley civilization developed a form of writing known as the Indus script c. 2600 BCE, although its precise nature remains undeciphered. [20] The Chinese script, one of the oldest continuously used writing systems in the world, originated around the late 2nd millennium BCE, evolving from oracle bone script used for divination purposes ...