File:Practical Electrics Mar 1924 pg282.png
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![File:Practical Electrics Mar 1924 pg282.png](https://upload.wikimedia.org/wikipedia/commons/thumb/7/7d/Practical_Electrics_Mar_1924_pg282.png/450px-Practical_Electrics_Mar_1924_pg282.png?20080722025439)
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