Reed water tube boiler straight tubes through which water and steam circulated more freely, it was considered by some contemporary writers on the subject such as Leslie S. Robertson as "behind" in its circulation because of the absence of down-comers. Whereas the Yarrow boilers fitted to the armoured cruiser of 1905 evaporated 11.664 pounds (5.291 kg) of water per pound (454 g) of coal at 100 degrees centigrade (212 degrees Fahrenheit) with natural draught, by the same measure a Reed boiler as fitted to the torpedo boat destroyer of 1896 evaporated 12 pounds (5.44 kg). An advantage of the Yarrow boiler was in weight:
Singapore-Cambridge GCE Normal Level "(abbreviated as N(A))" and Normal (Technical) "(abbreviated as N(T))" streams respectively. The GCE N(A)Level-Normal Academic Level, is taken by Normal Academic students after four years of secondary school education. This may lead to a possibility of moving on to the Secondary 5N(A)stream to take their 'O'-Levels. Alternatively, they may take the O-Levels without taking the N(A)-Level.In the Normal (Academic) course, students offer 6-8 subjects in the GCE ‘N’ Level examination. They have, as compulsory subjects, English Language, Mother Tongue and Mathematics. For upper secondary, Combined Humanities and a Science subject are also compulsory. The aggregate used for this stream is