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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 first shipment of Spirograph arrived just before Christmas in 2012. The Spirograph (along with Kahootz' Lite-Brite) was exhibited at the 2013 Sweet Suite 13 [4] show in Chicago, Illinois and the 2014 American International Toy Fair in New York City, New York. [5] Since then, Kahootz Toys has expanded and released numerous new products and ...
Bruno Abakanowicz died suddenly on 29 August 1900. In his will, he made Sienkiewicz the tutor of his sole daughter Zofia, who later graduated from the London School of Economics and the Sorbonne and was murdered during World War II at the Auschwitz concentration camp.
As a young man in 1827 he had developed a so-called "Speiragraph", an early prototype for the spirograph. He evidently continued on with experiments and inventions, and on 27 February 1860 received British patent no. 537 for 28 monocular and stereoscopic variations of cylindrical stroboscopic devices (see zoetrope ). [ 7 ]
[6] [16] Genomic evidence places the time of origin for syphilis in the New World at about 9,000 years ago. [3] [4] The situation in the Old World had been murkier, with fewer specimens clearly pointing to treponematosis rather than some other disease. Added to this conundrum, there was no documentary record on syphilis, a particularly horrible ...
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.
Weaving the Web : the original design and ultimate destiny of the World Wide Web by its inventor. San Francisco: HarperSanFrancisco. ISBN 0-06-251586-1. OCLC 41238513. Brügger, Niels (2017). Web 25 : histories from the first 25 years of the World Wide Web. New York, NY. ISBN 978-1-4331-3269-8.