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100% needed
| Highscores (21 registered players) | ||||
|---|---|---|---|---|
| Member | Score | Time | Date | |
| 1 | joc3942 | 100% | 0:08.0 min. | 5 May, '14 |
| 2 | breknov | 100% | 0:09.2 min. | 21 Jun, '09 |
| 3 | ∞Times Infinity∞ | 100% | 0:09.3 min. | 13 Mar, '16 |
| 4 | arbivara | 100% | 0:10.9 min. | 20 Jun, '09 |
| 5 | MrT | 100% | 0:10.9 min. | 19 Jun, '09 |
| 6 | Poloazer | 100% | 0:11.1 min. | 12 Jul, '09 |
| 7 | ollipo | 100% | 0:12.4 min. | 2 May, '14 |
| 8 | Aquambulushirsutus | 100% | 0:12.4 min. | 20 Jun, '09 |
This is an online quiz called Spark Testing
There is a printable worksheet available for download here so you can take the quiz with pen and paper.
Touch ferrous metals to a grindstone, and you get sparks. An experienced eye can often identify the metal by the sparks. Can you?
credit for the image:
Oberg, Erik; Jones, Franklin Day (1918), Iron and Steel (1st ed.), The Industrial Press.
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