History Magnetic stirrer

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different sizes of magnetic stir bars.




a mixture of soil , deionized water being stirred ph calibrate.


arthur rosinger of newark, new jersey, u.s.a. obtained patent 2,350,534, titled magnetic stirrer on 6 june 1944, having filed application therefore on 5 october 1942. mr. rosinger s patent includes description of coated bar magnet placed in vessel, driven rotating magnet in base below vessel. mr. rosinger explains in patent coating magnet in plastic or covering glass or porcelain makes chemically inert.


the plastic-coated bar magnet independently invented in late 1940s edward mclaughlin, of torpedo experimental establishment (tee), greenock, scotland, named flea because of way jumps if rotating magnet driven fast.


an earlier patent magnetic mixer 1,242,493, issued 9 october 1917 richard h. stringham of bountiful, utah, u.s.a. mr. stringham s mixer used stationary electromagnets in base, rather rotating permanent magnet, rotate stirrer.


the first multi-point magnetic stirrer developed , patented salvador bonet of sbs company in 1977. introduced practice of noting denomination of stirring power in liters of water , market standard today.


a heating element, power may range few hundred few thousand watts, can incorporated stirrer allow reaction flask heated , stirred @ same time. maximum reachable fluid temperature depends on size of flask, quantity of solution heated, , power of heating element.








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