Science for Beginners: An Introduction to the Method and Matter of Science

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World Book, 1920 - Science - 388 pages
 

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Page 280 - And when neither sun nor stars in many days appeared, and no small tempest lay on us, all hope that we should be saved was then taken away.
Page 326 - By work, then, we mean the effect 337 produced by the force, and where there is no effect, no work has been done. Quantity of work. If a teamster is hired to haul a load of grain to market, he first takes note of the size of the load and then immediately wants to know how far it is to the place where it is to be delivered. His team will have to exert a certain force to haul the load, and it also makes a difference through what distance that force must act. The farmer knows that it requires twice...
Page 108 - Prodest et sapo; Galliarum hoc inventum rutilandis capillis. Fit ex sebo et cinere. Optimus fagino et caprino; duobus modis, spissus ac liquidus; uterque apud Germanos majore in usu viris quam feminis.
Page 293 - Rub a dry glass tube or rod with silk and present it to the pith ball. Two things will happen to the pith ball: at first it will be attracted; but presently the ball will fly away, and then the excited glass will repel the ball. (2) Repeat the same test with the sealing wax rubbed with the flannel. The pith ball is affected in exactly the same way. The excited glass or wax causes the ball to become charged with electricity, and then the ball is repelled by the rod or wax. As a magnet will cause a...
Page 67 - Water is in part composed of oxygen. In Exercise 3 on page 52, hydrogen and the oxygen of the air were made to unite, and the product of their combination was water. Putting that fact with what we have just learned, we conclude that water is a compound formed by the chemical union of the two gases, hydrogen and oxygen. Each molecule of water contains two atoms of hydrogen and one atom of oxygen.
Page 335 - A tool is but the extension of a man's hand, and a machine is but a complex tool. And he that invents a machine augments the power of a man and the well-being of mankind.
Page 26 - I am the daughter of earth and water, And the nursling of the sky ; I pass through the pores of ocean and shores ; I change, but I cannot die...
Page 170 - Cooking starchy foods. Raw starch is not easily digested, and hence potatoes and other vegetables and green fruits should be thoroughly cooked. In ripe fruits most of the starch has been changed to sugar, which, because it is readily soluble, is easily digested without cooking. A mealy boiled potato is, in fact, near akin to a lump of sugar; for the potato, like all forms of starchy food, must be turned into a kind of sugar before it can be absorbed into the system. Color of the potato. Another important...
Page 208 - ... any of the examples of motion which were studied in the last chapter. The waves of the sea, the light that comes to our eyes, the sound that strikes our ears, and the waves that carry the wireless telegraph messages across the sea are all the result of motion of this kind. The pendulum and its vibration. A pendulum consists of a weight so suspended as to move freely (Fig. 138). The distance from the point of suspension to the center of the weight is the length of the pendulum. Let us study the...
Page 167 - ... of the living forms of this little kingdom of life ; or hand it to the botanist, well trained in the lower orders of plants, and see how many of the living forms which these few handfuls of dirt contain he can classify. Present this miniature farm to the chemist and the physicist, and let them puzzle over it. Call in the farmer, and ask him what plants will thrive best in it; or keep the soil warm and moist for a time, and have the gardener say of the tiny plants that appear as by magic which...

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