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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 ...
The World Wide Web enabled the spread of information over the Internet through an easy-to-use and flexible format. It thus played an important role in popularising use of the Internet. [49] Although the two terms are sometimes conflated in popular use, World Wide Web is not synonymous with Internet. [50]
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 .
Silent reading is reading done silently, or without speaking the words being read. [ 1 ] Before the reintroduction of separated text (spaces between words) in the Late Middle Ages , the ability to read silently may have been considered rather remarkable, though some scholars object to this idea.
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.
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.
A pneumograph, also known as a pneumatograph or spirograph, is a device for recording velocity and force of chest movements during respiration.While spirometry measures respiratory rate and other markers of respiratory health via analysis of the airflow from the lungs during inhalation and exhalation, pneumography measures the respiratory rate via chest motion.