First Lines of Natural Philosophy, Divested of Mathematical Formulae: Being a Practical and Lucid Introduction to the Study of the Science : Designed for the Use of Schools and Academies, and for Readers Generally who Have Not Been Trained to the Study of the Exact Sciences, and Those who Wish to Enter Understandingly Upon the Study of the Mixed Sciences
E.H. Butler & Company, 1846 - 402 páginas
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Página 11 - A plane rectilineal angle is the inclination of two straight lines to one another, which meet together, but are not in the same straight line.
Página 11 - Straight lines which are parallel to the same straight line are parallel to one another. Triangles and Rectilinear Figures. The sum of the angles of a triangle is equal to two right angles.
Página 19 - This index of refraction is still more materially affected when a body passes from the solid to the liquid, or from the liquid to the gaseous condition...
Página 81 - ... the angle of reflection is always equal to the angle of incidence, the image for any point can be seen only in the reflected ray prolonged.
Página 223 - ... the ratio between the sine of the angle of incidence and the sine of the angle of refraction is a constant, depending only upon the nature of the two media.
Página 217 - The disciples of Plato contributed not a little to the advancement of optics, by the important discovery they made, that light emits itself in straight lines, and that the angle of incidence is always equal to the angle of reflection. Plato terms colours " the effect of light transmitted from bodies, the small particles of which were adapted to the organ of sight.
Página 153 - Archimedes," runs to the following effect : — " Every body plunged into a liquid loses a portion of its weight equal to the weight of the fluid which it displaces.
Página 58 - ... foot. HERE, by Mechanics, the force of gravity being to the force down the plane, as the length of the plane is to its height, therefore as 20 : 1 : : 1 (the force of gravity) : •£, ==/, the force on the plane.