. Trade tests; the scientific measurement of trade proficiency . PICTURE 4 6. Q. What kind of pre-heating is being used there?A. Charcoal. 252 TRADE TESTS. PICTURE 5 7. Q. What would happen if that plate were not held open duringwelding? A. (i) Over-lapping (lap). (2) Warp (buckle). (One sufficient) PICTURE 6 8. Q. What is the materialaround the blow pipeon that fender?A. (i). Asbestos.(2) Clay. (One sufficient)

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