(b) Explain why.
3. Outline and describe briefly, a simple method of building a popular type of welding table.
4. (a) What is the name and style of bricks used in the welding shop?
(b) Name at least three purposes for which these bricks are used.
5. (a) Why does an emery wheel play such an important part in the oxy-acetylene welding industry?
(b) Why is it desirable to have a flexible shaft attachment for the emery wheel, if possible?
(c) Name some of the important things a flexible shaft attachment is used for in the preparation and finishing of welds.
6. (a) In what kind of containers is retort cement purchased in the commercial world?
(b) Where is retort cement used in the welding shop?
(c) How does it differ from the ordinary clay or putty?