Elements of Natural Philosophy Designed for Academies and High Schools

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Harper, 1858 - Physics - 351 pages

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Page 22 - LAW I. Every body continues in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it.
Page 249 - ... which passes over a small red figure upon a green ground, when gently agitated, is an effect of brilliant complementary colors, and has no connexion with the nature of the material with which the color is associated. The phenomenon to be explained in the experiment of the " dancing mice " is this : When a green figure or stripe is worked upon a red ground, and the card gently agitated, a shade of lighter green appears to spread over the whole figure, and overlap the surrounding red ground. A...
Page 123 - The pressure of a liquid on any surface immersed in it is equal to the weight of a column of the liquid whose base is the...
Page 38 - A person sitting on a chair cannot rise from it without either stooping forward to bring the centre of gravity over the feet, or drawing back the feet to bring them under the centre of gravity. If a person stand with his side close against a wall, his feet being close together, he...
Page 111 - Now the distance of the centre of oscillation from the point of suspension...
Page 209 - This is strikingly shown in an alloy called the " fusible metal," which is composed of 8 parts of bismuth, 5 of lead, and 3 of tin, and melts at 203° F.
Page 252 - The magnifying power of the Compound Microscope is estimated as follows. First, the diameter of the image will be to that of the object as their respective distances from the lens. Secondly, the image is magnified by the eye-glass according to the principles of the single microscope, (Art.
Page 42 - POWERS, are six in number; viz. 1. The Lever; 2. The Wheel and Axle; 3. The Pulley; 4. The Inclined Plane; 5. The Screw; 6. The Wedge.
Page 36 - If the centre of gravity of a body be supported on a point, or axis, and the body is free to turn round such axis, the body will, in that case, remain at rest in any position in which it may be placed ; for, according to what has been already stated, the resultant of the gravitating forces of all its particles must be in the direction of a vertical line passing through the centre of gravity, and the whole weight of the body may be considered as acting in that line. But, if the centre of gravity be...
Page 239 - Rule 2, if the side whose radius is 2 is turned to parallel rays. 5. The lens which has the least spherical aberration is a double convex one, whose radii are as 1 to 6. When the face whose radius is 1 is turned towards parallel rays, the aberration is only...

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