previously made of mild steel and required frequent repair and replace-
ment due to the development of rust and erosion by the continual passage
of the coal. They were replaced by aluminium chutes and a much better
performance was then obtained.
(a) Why might aluminium be less damaged by the passage of the moist
coal?
(b) What other materials would you have considered worth investigating?
(c) What tests might be used to compare materials for this purpose?
17 (a) What properties are required of the material used for the hull of
a
small
boat?
(b) Materials that have been used for small boat hulls are wood, metals and
composite ...
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