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applied ascend atmosphere axis axle ball beam body center of gravity centrifugal force circumference common center condensed conductor consequently cycloid cylinder density depth descend diameter diminished direction distance earth effect elastic electricity elevation equal equilibrium fall feet per second fluid force of gravity forces acting friction fulcrum given glass greater heat Hence horizontal inches inclined plane increased length lever Leyden jar machine magnet mechanical mechanical advantage Mechanical Philosophy miles momentum motion move Natural Philosophy opposite parallel parallelogram particles pendulum perpendicular pipe piston placed portion pounds pressure principle produced proportion pulley quantity of matter quicksilver radius ratio rays rection represented resistance rest right angles rope screw side solid space described specific gravity square steam string suppose surface sustained tion triangle tube valve velocity vessel vibrations wedge weight wheel wind
Seite 341 - ... 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.
Seite 557 - ... 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...
Seite 283 - ... 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.
Seite 142 - CIRCULAR arcs, is to the time down half the length of the pendulum, as the circumference of a circle to its diameter...
Seite 547 - 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...
Seite 537 - ... 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.
Seite 517 - 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.
Seite 185 - 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...