![File:Spark testing 2.png](http://upload.wikimedia.org/wikipedia/commons/thumb/2/25/Spark_testing_2.png/800px-Spark_testing_2.png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:43, 19 May 2009 | ![]() | 979 × 606 (323 KB) | Wizard191 | Corrected image to include sample (H). |
22:45, 15 May 2009 | ![]() | 928 × 680 (339 KB) | Wizard191 | {{Information |Description={{en|1=Diagram of sparks for spark testing various types of ferrous materials. Key: (A) Wrought iron (B) Mild steel (C) Steel with 0.5 to 0.85% carbon (D) High-carbon tool steel (E) High-speed steel (F) Manganese steel (G) Mush |
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