. Trade tests; the scientific measurement of trade proficiency . PICTURE 1 Q. What are the large holes in that sheet for?A. Superheater tubes (flues) (units). THE PICTURE TRADE TEST METHOD 237 2. Q. What do you call the space between the holes?A. (i) Bridges. (2) Pitch. (3) Ligaments. (One sufladent) 3. Q. How do you repair a crack in that sheet?A. (i) Cut (chip) (V) out and weld. (2) Weld. (3) Patch (plug). (One sufficient) 4. Q. What part of that is the combustion chamber?A. (i) B (A). (2) From flue sheet back. (3) Between flue sheet and firebox. (One sufficient). PICTURE 2 5. Q. What is tha
. Trade tests; the scientific measurement of trade proficiency . PICTURE 1 Q. What are the large holes in that sheet for?A. Superheater tubes (flues) (units). THE PICTURE TRADE TEST METHOD 237 2. Q. What do you call the space between the holes?A. (i) Bridges. (2) Pitch. (3) Ligaments. (One sufladent) 3. Q. How do you repair a crack in that sheet?A. (i) Cut (chip) (V) out and weld. (2) Weld. (3) Patch (plug). (One sufficient) 4. Q. What part of that is the combustion chamber?A. (i) B (A). (2) From flue sheet back. (3) Between flue sheet and firebox. (One sufficient). PICTURE 2 5. Q. What is that man doing?A. Caulking. 6. Q. What is that operation for? A. (i) Make it steam tight (stop leak). (2) Tighten sheet. (One sufficient) 7. Q. What must you usually do to the edge of a sheet before caulking it?A. (i) Chip. (2) Bevel. (One sufficient) 238 TRADE TESTS 8. Q. A. Q. A. What may happen if the holding rivets are too far fromthe edge of the sheet? (i) Cause leakage. (2) Caulking edge (lap) lift (sheet turn up). (3) Drive sheet off ring. (4) Undermine sheet (sheet loosen). (One sufficient)What part of the boiler is that man working on? (i) Mud ring. (2) Right front corner. (One sufficient)
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