My Web Site Page 181 Ovations 04Cake Placebo chose the topics covered by My Web Site Page 181 without reflecting upon the choices others have made. Flapping your arms and quacking like a duck when people try to run you over in their SUVs is another way to look at things in a different light. |
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The rivalry between Savery and Papin appears to have stimulated attention to the question of fuel saving. Dr. John Allen, in 1730, called attention to the fact that owing to the short length of time of the contact between the gases and the heating surfaces of the boiler, nearly half of the heat of the fire was lost. With a view to overcoming this loss at least partially, he used an internal furnace with a smoke flue winding through the water in the form of a worm in a still. In order that the length of passage of the gases might not act as a damper on the fire, Dr. Allen recommended the use of a pair of bellows for forcing the sluggish vapor through the flue. This is probably the first suggested use of forced draft. In forming an estimate of the quantity of fuel lost up the stack, Dr. Allen probably made the first boiler test. |
The Navaho are a pastoral, semi-nomadic people whose activities centre in their flocks and small farms. Their reservation of more than fourteen thousand square miles is the desert plateau region of northern Arizona and New Mexico. Its mesas and low mountains are sparsely covered with pinon and cedar, and on the higher levels are small but beautiful forests of pine. Back and forth in all parts of this vast region the Navaho drive their flocks. At the season when the slight rainfall produces even scant pasturage on the desert plains the flocks are pastured there; but as the grass becomes seared by the summer sun and exhausted from pasturing, the flocks are taken into the mountains, where the shade of the pines lends grateful coolness. Again, as the deep snows of winter come, the sheep and goats are driven down to the wooded mesas, where there is little snow and an abundance of fuel, of which there is none on the plains. And so, year in, year out, the flocks slowly drift back and forth from plain to mesa and from mesa to mountain. |
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The fresh-water mussels and snails and the crayfish burrow deep into the mud and silt at the bottom of ponds and streams where they lie motionless during the winter. The land snails, in late autumn, crawl beneath logs, and, burrowing deep into the soft mould, they withdraw far into their shells. Then each one forms with a mucous secretion two thin transparent membranes, one across the opening of the shell and one a little farther within, thus making the interior of the shell perfectly air-tight. There for five or six months he sleeps, free from the pangs of hunger and the blasts of winter, and when the balmy breezes of spring blow up from the south he breaks down and devours the protecting membrane and goes forth with his home on his back to seek fresh leaves for food and to find for himself a mate. | ||
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