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A magnetic stirrer or magnetic mixer is a laboratory device that employs a rotating magnetic field to cause a stir bar (or flea) immersed in a liquid to spin very quickly, thus stirring it. The rotating field may be created either by a rotating magnet or a set of stationary electromagnets, placed beneath the vessel with the liquid.
Although the magnetic stirrer has lately come to replace the shaker, it is still the preferred choice of equipment when dealing with large volume substances, when simultaneous agitation is required or when stirring bar could destroy delicate content like living cells. [1]
This is a device formed by a metallic bar (called the agitation bar) which is normally covered by a plastic layer, and a sheet that has underneath it a rotatory magnet or a series of electromagnets arranged in a circular form to create a magnetic rotatory field. Commonly, the sheet has an arrangement of electric resistances that can heat some ...
A hot plate or hotplate is a heated flat surface on a stove or electric cooker on which food may be cooked. [3] It comprises a heated top which is flat and usually circular, and may be made of metal, ceramic, or heat-resistant glass, with resistive wire forming a heating element fitted underneath and a thermostat to control the temperature.
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An early induction cooker patent from 1909 illustrates the principle. Current in the coil of wire S induces a magnetic field in the magnetic core M. The magnetic field passes through the bottom of the pot A, inducing eddy currents within it. Unlike this concept, a modern cooking surface uses electronically generated high-frequency current.
Stirrer may refer to: Agitator, a general type of mechanical device; Magnetic stirrer, a laboratory device; Stirring rod, a simple laboratory tool; Stir stick, for stirring drinks; Stirring spoon, a type of spoon; Whisk or other kind of stirrer used in cooking; Mixer (appliance), a kitchen appliance
The first mixer with electric motor is thought to be the one invented by American Rufus Eastman in 1885. [8] [9] [10] The Hobart Manufacturing Company was an early manufacturer of large commercial mixers, [11] and they say a new model introduced in 1914 played a key role in the mixer part of their business. [12]