File:Incandescent Electric Lighting - Efficiency - Fig 10.png
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![File:Incandescent Electric Lighting - Efficiency - Fig 10.png](http://upload.wikimedia.org/wikipedia/commons/thumb/4/43/Incandescent_Electric_Lighting_-_Efficiency_-_Fig_10.png/800px-Incandescent_Electric_Lighting_-_Efficiency_-_Fig_10.png)
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current | 20:45, 18 April 2022 | ![]() | 2,061 × 1,414 (271 KB) | Sp1nd01 | Uploaded a work by Louis H. Latimer from https://en.wikisource.org/wiki/Page:Incandescent_electric_lighting-_A_practical_description_of_the_Edison_system.djvu/142 with UploadWizard |
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