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:
Earth, Air, Fire, and Water how a credible Dark Sun campaign could be run without it. Earth, Air, Fire, and Water Earth, Air, Fire, and Water is an accessory for the 2nd edition of the "Advanced Dungeons & Dragons" fantasy role-playing game, published in 1993. "Earth, Air, Fire, and Water" expands the role of the cleric in the Dark Sun setting by adding new goals, duties, and abilities. As detailed in the "Dark Sun Boxed Set" rules, Athasian clerics do not worship gods, but instead receive spells from the four elemental planes. "Earth, Air, Fire, and Water" clarifies this premise, explaining that clerics form pacts