Staple Dietary Ingredients Secured | My Web Site Page 294 Chapter 03 Page 05

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As soon as the building operations are fully completed, the eager little householder sallies forth into his pond or brook in search of a mate who will come and stock his neatly-built home for him. At this stage of the proceedings, his wedding-garment becomes even more brilliant and glancing than ever; he gleams in silver and changeful gems; when he finds his lady-love, he dances round her, "mad with excitement," as Darwin well phrased it, looking his handsomest and best with his lustrous colours glistening like an opal. If she will listen to his suit, he grows wild with delight, and coaxes her into the nest with most affectionate endearments. In No. 2, as you perceive, the mate of his choice has been induced to enter, and is laying her eggs in the dainty home his care has provided for her. The father fish, meanwhile dances and capers around, in a _pas de triomphe_ at the success of his endeavors.

Let us take for example one of the 240 horse-power Babcock & Wilcox boilers here in the University. The height of the columns may be taken as 4½ feet, measuring from the surface of the water to about the center of the bundle of tubes over the fire, and the head would be equal to this height at the maximum of circulation. We should, therefore, have a velocity of 8(4½)^{½} = 16.97, say 17 feet per second. There are in this boiler fourteen sections, each having a 4-inch tube opening into the drum, the area of which (inside) is 11 square inches, the fourteen aggregating 154 square inches, or 1.07 square feet. This multiplied by the velocity, 16.97 feet, gives 18.16 cubic feet mingled steam and water discharged per second, one-half of which, or 9.08 cubic feet, is steam. Assuming this steam to be at 100 pounds gauge pressure, it will weigh 0.258 pound per cubic foot. Hence, 2.34 pounds of steam will be discharged per second, and 8,433 pounds per hour. Dividing this by 30, the number of pounds representing a boiler horse power, we get 281.1 horse power, about 17 per cent, in excess of the rated power of the boiler. The water at the temperature of steam at 100 pounds pressure weighs 56 pounds per cubic foot, and the steam 0.258 pound, so that the steam forms but 1/218 part of the mixture by weight, and consequently each particle of water will make 218 circuits before being evaporated when working at this capacity, and circulating the maximum weight of water through the tubes.

The loss at the Allia had been so great that enough men were not left to guard the walls of the city. It was therefore resolved that those in the vigor of their age should withdraw to the Capitol, taking with them all the provisions in the city; that the priests and Vestal Virgins should convey the objects of religious reverence to Caere; and that the rest of the population should disperse among the neighboring towns. But the aged senators, who had been Consuls or Censors, seeing that their lives were no longer of any service to the state, sat down in the forum on their curule thrones awaiting death. When the Gauls entered the city they found it desolate and deathlike. They marched on, without seeing a human being till they came to the forum. Here they beheld the aged senators sitting immovable, like beings of another world. For some time they gazed in awe at this strange sight, till at length one of the Gauls ventured to go up to M. Papirius and stroke his white beard. The old man struck him on the head with his ivory sceptre; whereupon the barbarian slew him, and all the rest were massacred. The Gauls now began plundering the city; fires broke out in several quarters; and with the exception of a few houses on the Palatine, which the chiefs kept for their own residence, the whole city was burnt to the ground.

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