| 31. | This was a result of two features : firstly the low mass of metal in the heating surface rose quickly to temperature.
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| 32. | In order to increase the heating surface the boilers were made longer than previous types, and were fitted with raised fireboxes.
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| 33. | These locomotives represented a further advance on earlier 6th Class locomotives, with a greater heating surface and a larger firegrate area.
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| 34. | The differences between the A1 and A2 classes were minor : in particular, the A2 class had a larger heating surface.
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| 35. | On March 24, 2015, NASA reported the first detection of nitrogen released after heating surface sediments on the planet Mars.
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| 36. | To provide enough heating surface to generate sufficient steam through its projected use the firebox was made wider for greater burning capacity.
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| 37. | She had 56 corrugated furnaces heating six double-ended and two single-ended boilers that had a combined heating surface of.
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| 38. | She had nine corrugated furnaces with a combined grate area of heating three single-ended boilers with a combined heating surface of.
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| 39. | These engines were slightly longer with larger water tanks and had larger firebox and boiler heating surfaces, with an increased boiler pressure.
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| 40. | Each had 18 corrugated furnaces with a combined grate area of that heated six single-ended boilers with a combined heating surface of.
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