Characteristics of Sparks Generated by the grinding of Metals |
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| Metal | Volume of Stream | Relative Length of Stream in Inches* | Colour of Stream Close to the Wheel | Colour of Sparks Near end of Stream | Quantity of 'Spurts' | Nature of 'Spurts' |
|
| Wrought Iron | Large | 65" | Straw | White | Very Few | Forked | |
| Machine Steel | Large | 70" | White | White | Few | Fine, Repeating | |
| Carbon Tool Steel | Moderately Large | 55" | White | White | Very Many | Fine, Repeating | |
| Grey Cast Iron | Small | 25" | Red | Straw | Many | Fine, Repeating | |
| White Cast Iron | Very Small | 20" | Red | Straw | Few | Fine, Repeating | |
| Annealed Malleable Iron | Moderate | 30" | Red | Straw | Many | Fine, Repeating | |
| High Speed Steel | Small | 60" | Red | Straw | Extremely Few | Forked | |
| Manganese Steel | Moderately Large | 45" | White | White | Many | Fine, Repeating | |
| Stainless Steel | Moderate | 50" | Straw | White | Moderate | Forked | |
| Tungsten-Chromium Die Steel | Small | 35" | Red | Straw** | Many | Fine, Repeating** | |
| Nitrided Nitralloy | Large (Curved) | 55" | White | White | Moderate | Forked | |
| Stellite | Very Small | 10 | Orange | Orange | None | ---- | |
| Cemented Tungsten -Carbide | Extremely Small | 2" | Light Orange | Light Orange | None | ---- | |
| Nickel | Very Small*** | 10" | Orange | Orange | None | ---- | |
| Copper Brass Aluminium | ---- | ---- | ---- | ---- | ---- | ---- | |