Everyday Science

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Allyn and Bacon, 1919 - Science - 561 pages
 

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Page 461 - These simple machines are the lever, the wheel and axle, the pulley, the inclined plane, the wedge, and the screw.
Page 162 - Circulating around each ocean there is a continuous drift of surface water extending to a depth of from 300 to 600 feet and varying in rate from a few miles up to fifty or more miles a day. In fact these rotating currents are the chief natural basis for the division of the oceanic area into six oceans, as our geographies generally divide them. These currents circulate in the northern hemisphere in the direction in which the hands of a watch move and in the southern hemisphere in the opposite direction....
Page 81 - In this way each piece is made to indicate its own temperature without possibility of mistake. Liquid Thermometers. In the most common form of thermometer, temperature is measured by the expansion of mercury in glass. On the end of a glass tube of very fine bore, a bulb is blown (see Fig.
Page 66 - Force of gravity is a term used to denote the attraction between the earth and bodies upon or near its surface. It always acts in a straight line between the center of the body and the center of the earth. The force of gravity varies at points on the earth's surface. It is slightly less on the top of a high mountain than at the level of the sea. For this reason the weight of a body also varies. But if the weight of a body at any place be divided by the force of gravity at that place, the result is...
Page 31 - evidence of things not seen," in the fulness of Divine grace ; and was profound on this, the greatest concern of human life, while unable even to comprehend how the " inclination of the earth's axis to the plane of its orbit" could be the cause of the change of the seasons.
Page 85 - ... previously stated, the moisture content is separate and in addition to the typical gas. Cp is the specific heat of a gas at constant pressure and represents the ratio of the amount of the heat energy required to raise the temperature of a unit mass of the gas one degree compared with that required to raise the temperature of the same mass of water one degree (from the temperature of maximum density). Cm is the mean value of Cp between the temperature t* and t\.
Page 219 - It can be proved mathematically that all freely moving bodies on the earth's surface are deflected toward the right in the northern hemisphere and toward the left in the southern hemisphere.
Page 18 - ... There is as much difference between our universe of discourse and that in which our fathers lived before the Emancipation, as between the modern mind-picture of the physical universe and the one which prevailed until Copernicus proved that the earth moves around the sun. Just as, in ancient times, men thought that the earth was the center of the universe, and that their own homes, being equidistant on all sides from the horizon, were the center of the earth, so our fathers, in premodern times,...
Page 364 - To our eyes it is bounded by red at the one end and violet at the other, the edge being sharply marked at the red end, but less abruptly at the violet. But a ray of light contains besides the rays visible to our eyes others which...
Page 263 - Here the old river courses have been submerged, and the land between the rivers extends into the ocean in narrow, rather flat strips with many little inlets along the sides. Easy water communication is here possible to a considerable distance inland and to almost every part of the land surface near the coast. When the country was first settled, these water courses were most advantageous to the settlers, as the produce of the farms could be transported to sea-going ships with comparatively little...

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