| 21. | The floor of the dock is thick at the centre line, tapering to thick at the sides.
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| 22. | The centre lines saw the heaviest fighting.
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| 23. | After each goal, the non-scoring team restarts the game, with a face off on the centre line.
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| 24. | The ball is placed one metre in front of Worms along the centre line of the canvas.
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| 25. | They positioned the rotor hub directly over the wing centre line and behind the centre of gravity.
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| 26. | The combination of Healey, Thorold Merrett and Bill Twomey, Jr ., gave Collingwood a lethal centre line.
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| 27. | The seeker provides information on the deviation of the laser sport from the centre line of the detector.
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| 28. | Wires were suspended down each shaft from which the centre line was determined by means of a theodolite.
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| 29. | In August, Gaston led part of the centre line of the crusader army at the Battle of Ascalon.
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| 30. | The windows are filled with 4 coloured lead lights, 3 of which pivot along the horizontal centre line.
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