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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.
中级
Unknown
说明
1
1
Build the box
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.
此步骤所需材料：
未知材料1 non-magnetic box所需工具：
未知尺寸2
2
Mount the motor and magnet
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.
此步骤所需材料：
电动机1 个
未知金属1 bands and arms
马蹄形磁铁1 个所需工具：
螺丝刀套装3
3
Wire the speed control
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.
此步骤所需材料：
变阻器1 个
钮子开关1 个
带插头软线1 个所需工具：
螺丝刀套装4
4
Make the stirring rod
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.
此步骤所需材料：
条形磁铁组1 rod magnet
玻璃管1 shell所需工具：
本生灯5
5
Stir
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.
所需工具：
玻璃烧杯材料
9- 1 non-magnetic box占位符
- 1 个占位符
- 1 bands and arms占位符
- 1 个占位符
- 1 个占位符
- 占位符
- 1 个占位符
- 1 rod magnet占位符
- 1 shell占位符
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