International Library of Technology: A Series of Textbooks for Persons Engaged in the Engineering Professions and Trades, Or for Those who Desire Information Concerning Them, Volumen5

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International Textbook Company, 1902
 

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Página 479 - ... specific gravity — as applied to wood, the ratio of the ovendry weight of a sample to the weight of a volume of water equal to the volume of the sample at some specific moisture content, as green, air-dry, or ovendry.
Página 375 - That is, the upward pressure exceeds the downward pressure by the weight of a volume of water equal to the volume of the body.
Página 586 - ... one pound of water one degree Fahrenheit is called a British thermal unit.
Página 507 - MOMENT OF A FORCE— PARALLEL FORCES 22. Moment of a force. The moment of a force about any point is the product of the magnitude of the force and the perpendicular distance from the point to the line of action of the force.
Página 583 - The best example of radiant heat is that received from the sun, the intervening space in this case being 93,000,000 miles. A person standing in front of a fire, but at some distance from it, feels a sensation of warmth which is not due to the temperature of the air, for, if a screen be interposed between him and the fire, the sensation immediately ceases, which would not be the case if the surrounding air had a high temperature. Hence, bodies can send out rays which excite heat and which penetrate...
Página 442 - Law. — The temperature remaining the same, the volume of a given quantity of gas varies inversely as the pressure.
Página 487 - The wind arrows show the wind to be moving in a direction opposite to the movement of the hands of a watch (counterclockwise) when it is laid, face up, on the map.
Página 586 - The thermal unit is used by American and British scientific writers, as being better adapted to their calculations. 1 13O. The Calorie. — The amount of heat necessary to raise one kilogram of -water 1° C. is called a calorie. One kilogram = 2.2 pounds and 1° C. = | X 1° F. ; hence, a calorie — 2.2 X...
Página 543 - The moment of a force about any point is the product of the force times the distance of its line of action from the point.
Página 586 - ... considerably; thus, mercury will be much hotter than water But as, from the conditions of the experiment, they have each been receiving the same amount of heat, it is clear that the quantity of heat which is sufficient to raise the temperature of mercury through a certain number of degrees will raise the...

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