Editing Magnetic stirrer (section)

== History ==

The first patent for a magnetic mixer is US 1,242,493, issued 9 October 1917 to Richard H. Stringham of [[Bountiful, Utah]]. Stringham's mixer used stationary electromagnets in the base, rather than a rotating permanent magnet, to rotate the stirrer.<ref>{{cite web | url=https://patents.google.com/patent/US1242493A/en | title=Electrical drink-mixer }}</ref>

Arthur Rosinger of [[Newark, New Jersey]] obtained US Patent 2,350,534, titled Magnetic Stirrer on 6 June 1944, having filed an application on 5 October 1942.<ref>{{cite patent | country = US | number = 2350534 |title=Magnetic Stirrer | gdate=6 June 1944 | inventor = Rosinger A }}</ref> Rosinger's patent includes a description of a coated bar magnet placed in a vessel, which is driven by a rotating magnet in a base below the vessel. Rosinger also explains in his patent that coating the magnet in plastic or covering it with glass or porcelain makes it chemically inert.

The plastic-coated bar magnet was independently invented in the late 1940s by Edward McLaughlin, of the [[Torpedo Experimental Establishment]] (TEE), [[Greenock]], Scotland, who named it the 'flea' because of the way it jumps about if the rotating magnet is driven too rapidly.{{citation needed|date=October 2020}}

The first multi-point magnetic stirrer was developed and patented by Salvador Bonet of SBS Company in 1977. He also introduced the practice of noting the denomination of stirring power in "litres of water", which is a market standard today.<ref>{{Cite web|url=https://www.labmanager.com/www.labmanager.com/evolution-of-biological-shakers-and-stirrers-18253|title=Evolution of Biological Shakers and Stirrers|website=Lab Manager}}</ref>