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Stirrer: Magnetic Stirrer, a Turning Horseshoe Magnet under a Free Magnet Rod (Rosinger, US 2,350,534, 1944)

Arthur Rosinger · Public domain (US patent drawing)

작성자

Penny

3. 11월 2026

Stirrer: Magnetic Stirrer, a Turning Horseshoe Magnet under a Free Magnet Rod (Rosinger, US 2,350,534, 1944)

The magnetic stirrer of the chemistry lab. A small motor in a box spins a horseshoe magnet just under the thin lid. A little magnet rod sealed in an inert shell lies loose in the flask on top and spins with it, stirring the liquid into a deep vortex with nothing poking through the neck, so the flask can stay closed, under pressure or vacuum. Result: a stirrer for laboratory liquids, speed set by a rheostat. Source: A. Rosinger, US 2,350,534 (1944). Unknown: sizes, the motor and the magnet alloys. Picture: the patent drawing.

중급

Unknown

안내

Build the box

Make a box with a bottom, side walls and a removable top, all of non-magnetic material. Make the top as thin as you can. Not given: the material, sizes.

이 단계의 재료:

알 수 없는 재료1 non-magnetic box

필요한 도구:

알 수 없는 치수

Mount the motor and magnet

Fix an electric motor in the middle of the box with its shaft upright, held by bands round its housing whose arms are screwed to the side walls. Fix a strong horseshoe permanent magnet on the shaft, poles up, so its pole faces turn as close under the thin top as possible. Not given: the motor, the magnet alloy.

이 단계의 재료:

전동기1 개

알 수 없는 금속1 bands and arms

말굽 자석1 개

필요한 도구:

드라이버 세트

Wire the speed control

Lead the motor wires out of the box through a regulating rheostat and a switch to a cord with a plug. The rheostat sets the motor speed, and so the stirring speed.

이 단계의 재료:

가감 저항기1 개

토글 스위치1 개

플러그 달린 코드1 개

필요한 도구:

드라이버 세트

Make the stirring rod

Take a small round permanent magnet rod, shorter than the width of the flask's bottom, and seal it in a thin shell of an inert material (porcelain, glass, Bakelite or a suitable plastic) so it cannot affect the liquid. Where bare iron or steel would do no harm, the shell may be left off. Ours: a sealed glass tube for the shell.

이 단계의 재료:

막대자석 세트1 rod magnet

유리관1 shell

필요한 도구:

분젠 버너

Stir

Stand a non-magnetic flask or beaker of the liquid on the box and drop in the rod. Switch on and set the speed: the rod follows the turning magnet and whips the liquid into a deep vortex. Set the rod off-centre and it both spins and travels round the bottom, stirring faster still. The vessel can be closed, since no shaft goes in.

필요한 도구: