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acquired acting action angle applied atmosphere attraction axis ball base beam becomes body called cause center of gravity column common consequently continued cylinder depth descend described diameter diminished direction distance earth effect elastic electricity equal example experiments extremity fall feet figure fluid force friction give given greater heat Hence horizontal inches inclined plane increased iron length less lever machine magnet manner matter means measure mechanical miles motion move nature observed opposite parallel passing pendulum perpendicular piston placed plane portion position pounds pressure principle produced proportion pulley quantity raised ratio remain represented resistance respectively rest resultant rise screw sides similar solid sound space square steam string supported suppose surface sustained tion triangle tube turn uniform varies velocity vessel vibrations weight wheel whole wind
Page 333 - ... is equal to the weight of a column of water whose base is the section of the piston, and whose height is the distance of the level of the water in the barrel AC, above the level in the reservoir.
Page 549 - ... concealed from its scrutiny ; for, however anatomists may differ on points of structure, or physiologists dispute on modes of action, there is that in what we do understand of the formation of the eye so similar, and yet so infinitely superior, to a product of human ingenuity, — such thought, such care, such refinement, such advantage taken of the properties of natural agents used as mere instruments for accomplishing a given end, as force upon us a conviction of deliberate choice and premeditated...
Page 275 - ... to their necks, so that in their frequent falls overboard, they are not in danger. Life-boats have a large quantity of cork mixed in their structure, or of air-tight vessels of thin copper or tin plate; so that, even when the boats are filled with water, a considerable part still floats above the general surface.
Page 134 - CIRCULAR arcs, is to the time down half the length of the pendulum, as the circumference of a circle to its diameter...
Page 539 - LIGHT is a change which light undergoes after certain refractions or reflexions, by which a ray acquires POLARITY, or different properties on different sides. This quality of light, which is one of the most remarkable of all its properties, was discovered by Huygens, during his investigations into the cause of double refraction as exhibited in the Iceland crystal ; but the attention of opticians was more particularly directed toward it by the discoveries of Malus, in 1810.* The knowledge of this...
Page 529 - ... nearly as 3 to 4 ; that is, in the ratio of the sine of incidence to the sine of refraction (Art. 749,) when flie light passes from water into air.
Page 509 - F will be a bright disc surrounded and rendered indistinct by a broad halo of light growing fainter and fainter from F to G and H. In like manner, every object seen through such a lens, and every image formed by it, will be rendered confused and indistinct by spherical aberration.
Page 177 - A man in a boat pulling a rope attached to a large ship, seems only to move the boat: but he really moves the ship a little, for...