Ovations On Other Sites - Ovation 06 Ovations 06Calibrated Amber chose the topics covered by Ovations On Other Sites - Ovation 06 without reflecting upon the choices others have made. And when you have finished learning all that you can and understand all that you have learned, vacationing with friends in the desert is another way to look at things in a different light. |
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You have all noticed a kettle of water boiling over the fire, the fluid rising somewhat tumultuously around the edges of the vessel, and tumbling toward the center, where it descends. Similar currents are in action while the water is simply being heated, but they are not perceptible unless there are floating particles in the liquid. These currents are caused by the joint action of the added temperature and two or more qualities which the water possesses. 1st. Water, in common with most other substances, expands when heated; a statement, however, strictly true only when referred to a temperature above 39 degrees F. or 4 degrees C., but as in the making of steam we rarely have to do with temperatures so low as that, we may, for our present purposes, ignore that exception. 2nd. Water is practically a non-conductor of heat, though not entirely so. If ice-cold water was kept boiling at the surface the heat would not penetrate sufficiently to begin melting ice at a depth of 3 inches in less than about two hours. As, therefore, the heated water cannot impart its heat to its neighboring particles, it remains expanded and rises by its levity, while colder portions come to be heated in turn, thus setting up currents in the fluid. |
That day we went over eleven successive hill ranges and crossed as many little streamlets between them. My men were terribly downhearted. We had with us a Mauser and two hundred cartridges, but although we did nothing all day long but look for something to kill we never heard a sound of a living animal. Only one day at the beginning of our fast did I see a big _mutum_--larger than a big turkey. The bird had never seen a human being, and sat placidly perched on the branch of a tree, looking at us with curiosity, singing gaily. I tried to fire with the Mauser at the bird, which was only about seven or eight metres away, but cartridge after cartridge missed fire. I certainly spent not less than twenty minutes constantly replenishing the magazine, and not a single cartridge went off. They had evidently absorbed so much moisture on our many accidents in the river and in the heavy rain-storms we had had of late, that they had become useless. |
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