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 and water BC. In the 6th book, Darius sent heralds throughout Hellas bidding them demand "earth and water" for the king (Hdt. 6.48). There were not many city-states that refused. In Book 7, he recounts that when the Persians sent envoys to the Spartans and to the Athenians demanding the traditional symbol of surrender, an offering of soil and water, the Spartans threw them into a well and the Athenians threw them into a gorge, suggesting that upon their arrival at the bottom, they could "Dig it out for yourselves." The demand for "earth and water" symbolized that those surrendering to Persians