| 21. | The third area forwards contained superheater headers, the regulators and the smokebox, but no deliberate heating surface.
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| 22. | These locomotives differed from those of the previous order by having slightly larger boilers with an increased heating surface.
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| 23. | In the smokebox, which is long, was located a small tube superheater with a heating surface of.
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| 24. | She had six water-tube boilers with a combined heating surface of that supplied steam at 400 screw propellers.
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| 25. | "Clan Campbell " s boilers had a combined heating surface of and supplied steam at 220 NHP.
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| 26. | The ship was also re-boilered with two water tube boilers that had a heating surface of and operated at.
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| 27. | This had the additional advantage of wrapping the heating surface closely around the furnace, but that was a secondary benefit.
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| 28. | Brick-lined end walls to this casing housed the firedoors or oil burner quarls, but had no heating surface.
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| 29. | The three most important improvements were :-wide steam passages, large heating surfaces and generous bearing surfaces on the wheels.
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| 30. | In the case of " Bonnington " the grate area of the boiler was over and the heating surface was.
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