Natural Philosophy for Common and High Schools

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Scribner, 1881 - Physics - 246 pages
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Page 241 - There is an equilibrium upon the wheel and axle when the power is to the weight as the radius of the axle to the radius of the wheel.
Page 123 - ... once reflected. Hence proceed the different colours of the rainbow : they are seven in number, and appear in the following order; red, orange, yellow, green, blue, indigo, and violet. These colours appear the more vivid as the cloud-s which are behind are darker, and the drops of rain fall closer.
Page 69 - After several months spent at sea," he says, " in a long passage from South America to Asia, my pocket chronometer and others on board announced one morning that a certain point of land was then bearing north from the ship, at a distance of fifty miles ; in an hour afterwards, when a mist had cleared away, the looker-out on the mast gave the joyous call of ' Land ahead ! ' verifying the report of the chronometers almost to one mile, after a voyage of thousands.
Page 218 - In the screw, an equilibrium is produced when the power is to the weight, as the distance between two contiguous threads is to the circumference of the circle described in one revolution of the power.
Page 241 - These are usually accounted six in number, viz. the Lever, the Wheel and Axle, the Pulley, the Inclined Plane, the Wedge, and the Screw.
Page 241 - ... when the power is to the weight as the height of the plane is to its length...
Page 142 - If there is a piston moving freely inside of a cylinder, and then if steam is let into the cylinder, first at one end and then at the other...
Page 7 - ... at the bottom of the page or the back of the book, in fine print and compact lists.
Page 108 - Yet the law of reflection is not transgressed. Every ray must be thrown in such a direction that the angle of reflection is equal to the angle of incidence.
Page 68 - The time of one vibration is in proportion to the square root of the length of the pendulum.

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