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:
Normal conditions be found. l Normal conditions Normal conditions are a restriction on philosophical arguments, especially in epistemology, in order to avoid objections perceived as digressive. As a reply to objections to an explanation of a phenomenon, e.g. a hypothesis or a theory, it is said, argument X holds [only] under normal conditions. In some cases, the concept of normal conditions tends to be rather blurred and the reply under normal conditions can tend to extend to everything that contradicts an argument. In cases, when the argument of normal conditions comes too often, according to the principle of Occam's Razor another explanation