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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 Zanclean flood or Zanclean deluge is theorized to have refilled the Mediterranean Sea 5.33 million years ago. [1] This flooding ended the Messinian salinity crisis and reconnected the Mediterranean Sea to the Atlantic Ocean, although it is possible that even before the flood there were partial connections to the Atlantic Ocean. [2]
Salt comes from two main sources: sea water, and the sodium chloride mineral halite (also known as rock salt). Rock salt occurs in vast beds of sedimentary evaporite minerals that result from the drying up of enclosed lakes, playas, and seas. Salt beds may be up to 350 metres (1,150 ft) thick and underlie broad areas.
The Alamo Sea in the 2013 video game Grand Theft Auto V is based on the Salton Sea. [149] The short documentary, The Useless Sea (2016), is a film focusing on the environmental challenges and the beauty surrounding the Salton Sea. [150] The album cover for Weyes Blood's Front Row Seat to Earth (2016) was photographed by the Salton Sea.
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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 company claims that the salt's low magnesium content means it has less of a bitter aftertaste than other salts. [5] Salt gained from evaporating seawater has a higher magnesium ion content than some table salts. [6] The company sells its original sea salt flakes, as well as smoked, chilli, and garlic varieties. [7]