British Steel Plc.

Alexander Rankin Cornforth

Peter John Trigg

Method and apparatus for ultrasonically testing sheet materials using

The testing of an article for deviations thereof from an optimum thickness range includes scanning the article by means of a thickness measuring device; making a plurality of thickness measurements of the article during each scan; averaging successive groups of a predetermined number of theoretical measurements during each scan; comparing the averages so obtained with predetermined desired averages and marking a visual record with symbols indicative of whether each group is within, greater than, or less than the desired average.

Testing articles

An arrangement for testing tube-like articles for defects includes scanning a defect detecting device in a helical path about the article; marking, upon receipt of defect indicative signals at the device, a pictorial record of the magnitude and position along the article of defects shown by the received defect indicative signals if they are greater than a predetermined magnitude; subjecting received defect indicative signals greater than said predetermined magnitude to predetermined repetition tests; and marking on the pictorial record the circumferential position about the article of defects shown by the received defect indicative signals if they satisfy the predetermined repetition tests.

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Alexander Rankin Cornforth