for Iron and Steel
- Keep blast furnaces in a condition where they must be frequently shut down for repair. In making fire-proof bricks for the inner lining of blast furnaces, put in an extra proportion of tar so that they will wear out quickly and necessitate constant re-lining.
- Make cores for casting so that they are filled with air bubbles and an imperfect cast results.
- See that the core in a mold is not properly supported, so that the core gives way or the casting is spoiled because of the incorrect position of the core.
- In tempering steel or iron, apply too much heat, so that the resulting bars and ingots are of poor quality.
for Other Metals
No suggestions available.