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 Singapore-Cambridge GCE Normal Level The Singapore-Cambridge General Certificate of Education Normal Level (N-Level) examination is a national examination held annually in Singapore. It is taken after four years in the normal academic or normal technical stream (secondary education). For subjects examined in English and foreign languages, the examining authority are the University of Cambridge Local Examinations Syndicate. For localized language subjects, the examining authority is the Ministry of Education, Singapore. The Singapore-Cambridge General Certificate of Education Normal Level examination is sub-categorized into Normal (Academic) Level (N(A) Level) and Normal (Technical) Level (N(T) Level), catering to candidates under the Normal (Academic)