9. Explain carefully how a malleable iron automobile, axle or transmission, housing that has been cracked or broken, can be re-enforced so that it will be stronger than ever.
10. Describe very briefly how malleable iron is made and in what respect it differs from cast iron when cold, and also when under the influence of the oxy-acetylene flame.
LECTURE NUMBER SIXTEEN
Subject—Carbon Burning
1. (a) Explain what is meant by carbon burning.
(b) In what respect is it used extensively?
2. (a) Will oxygen gas burn alone or does it merely aid combustion?
(b) Will carbon in a free state burn?
3. (a) Why is it advisable to remove only the spark plugs and not the entire valve cap or “bonnet” when burning carbon in a gas engine?
(b) Can it be done either way?
4. (a) Does it make a difference if the carbon is hard and dry in the cylinder?