. Trade tests; the scientific measurement of trade proficiency . PICTURE 1015. Q. What metal should be used as a filler rod in weldmg partsA and B together; A being of cast iron and B of steel?A. Cast PICTURE 11 16. Q. What is the relation between the pressures of the gas and airin that blow pipe?A. Air (oxygen) greater. THE PICTURE TRADE TEST METHOD 255

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