"Porosity" Quotes from Famous Books
 ... porosity in the trappean formations, the appearances are in a great degree deceptive, for all amygdaloids are, as already explained, porous rocks, into the cells of which mineral matter such as silex, carbonate of lime, and other ingredients, have ...
— The Student's Elements of Geology • Sir Charles Lyell
... that examining the vast porosity of bodies, every particle having its pores, and every particle of those particles having its own, he shows we are not certain that there is a cubic inch of solid matter in the universe, so far are we from conceiving what matter is. Having thus divided, as it were, light into its elements, and ...
— Letters on England • Voltaire
... many new uses for water: It will not be long before every truck and every commercial flower garden will have overhead irrigation. This is merely gas pipes ("seconds" rejected for blow holes or porosity are usually used) supported on posts say six feet above the ground. They are usually placed parallel about fifty feet apart, which will make four to the acre square, and have a single row of holes and a handle on each pipe, so that the spray can ...
— Three Acres and Liberty • Bolton Hall
... a soil unfit for the production of trees. If too much clay is present the soil becomes "stiff." If too much vegetable matter is present, the soil becomes "sour." The physical character of the soil is also important. By physical character is meant the porosity which results from breaking up the soil. This is accomplished by ploughing or cultivation. In nature, worms help to do this for the soil, but on streets an occasional digging up of the soil about the base of the ...
— Studies of Trees • Jacob Joshua Levison
... this temperature from the cylinder to the charcoal it is indispensable that the air surrounding the cylinder be heated to 480 deg. to 550 deg.. If the heating of the animal black exceeds 500 deg. the product hardens, diminishes in volume, and loses its porosity. There are two methods of ascertaining the temperature of the red-hot bone black by means of the pyrometer: First, by inserting the tube of the instrument into the black. (Fig. 6, a.) Second, by finding the temperature of the hot gases in the furnaces (Fig. 6, ...
— Scientific American Supplement, No. 288 - July 9, 1881 • Various |
