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Craigslist headquarters in the Inner Sunset District of San Francisco prior to 2010. The site serves more than 20 billion [17] page views per month, putting it in 72nd place overall among websites worldwide and 11th place overall among websites in the United States (per Alexa.com on June 28, 2016), with more than 49.4 million unique monthly visitors in the United States alone (per Compete.com ...
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 ...
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 ...
Spirograph images are hypotrochoids, with curved "sides". Polytopes (like the runcinated 6-simplexes) though have straight line segments. Andy Dingley 15:51, 27 December 2016 (UTC) I did overlook that difference. Thanks. My parents bought me a Spirograph round 1972. 83.85.143.141 16:11, 27 December 2016 (UTC)
Spirographa is a genus of parasitic fungi.It is the sole genus in the monotypic family Spirographaceae, belong to the order Ostropales. [1] The genus was circumscribed by Alexander Zahlbruckner in 1903, with Spirographa spiralis later assigned as the type species in 1923.
IC 418, also known as the Spirograph Nebula, is a planetary nebula located in the constellation of Lepus about 3,600 ly away from Earth. It spans 0.3 light-years across. The central star of the planetary nebula, HD 35914 , is an O-type star with a spectral type of O7fp. [ 4 ]
A spirometer is the main piece of equipment used for basic Pulmonary Function Tests (PFTs). Lung diseases such as asthma, bronchitis, and emphysema may be ruled out from the tests.
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