The Power That Preserves | My Web Site Page 106 Chapter 03 Page 02

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Reflecting in such random fashion, and strolling with no greater method, I worked my way back through Cheapside and found myself once more in front of Sweeting's window. Again the turtles attracted me. They were alive, and so far at any rate they agreed with me. Nay, they had eyes, mouths, legs, if not arms, and feet, so there was much in which we were both of a mind, but surely they must be mistaken in arming themselves so very heavily. Any creature on getting what the turtle aimed at would overreach itself and be landed not in safety but annihilation. It should have no communion with the outside world at all, for death could creep in wherever the creature could creep out; and it must creep out somewhere if it was to hook on to outside things. What death can be more absolute than such absolute isolation? Perfect death, indeed, if it were attainable (which it is not), is as near perfect security as we can reach, but it is not the kind of security aimed at by any animal that is at the pains of defending itself. For such want to have things both ways, desiring the livingness of life without its perils, and the safety of death without its deadness, and some of us do actually get this for a considerable time, but we do not get it by plating ourselves with armour as the turtle does. We tried this in the Middle Ages, and no longer mock ourselves with the weight of armour that our forefathers carried in battle. Indeed the more deadly the weapons of attack become the more we go into the fight slug-wise.

Now, when all the water has been heated to the boiling point corresponding to the pressure to which it is subjected, each added unit of heat converts a portion, about 7 grains in weight, into vapor, greatly increasing its volume; and the mingled steam and water rises more rapidly still, producing ebullition such as we have noticed in the kettle. So long as the quantity of heat added to the contents of the kettle continues practically constant, the conditions remain similar to those we noticed at first, a tumultuous lifting of the water around the edges, flowing toward the center and thence downward; if, however, the fire be quickened, the upward currents interfere with the downward and the kettle boils over (Fig. 1).

These experiments proved conclusively that the size of the steam drums in the cross drum design has no appreciable effect in determining the amount of liberating surface, and that sufficient liberating surface is provided in the circulating tubes alone. If further proof of the ability of this design of boiler to deliver dry steam is required, such proof is perhaps best seen in the continued use of the Babcock & Wilcox marine boiler, in which the cross drum is used exclusively, and with which rates of evaporation are obtained far in excess of those secured in ordinary practice. Quick Steaming--The advantages of water-tube boilers as a class over fire-tube boilers in ability to raise steam quickly have been indicated. Due to the constant and thorough circulation resulting from the sectional nature of the Babcock & Wilcox boiler, steam may be raised more rapidly than in practically any other water-tube design.

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