The Principles of Physics

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Ginn, 1895 - 634 pàgines
 

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Pàgina 335 - It will be seen, by construction, that an image in a plane mirror appears as far behind the mirror as the object is in front of it, and is of the same size and shape as the object.
Pàgina 489 - As a unit of resistance, the international ohm, which is based upon the ohm equal to 10" units of resistance of the CGS system of electromagnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grams in mass, of a constant cross-sectional area and of the length of 106.3 centimetres.
Pàgina 489 - Ampere, which is one-tenth of the unit of current of the CGS system of electromagnetic units and which is represented sufficiently well for practical use by the unvarying current which, when passed through a solution of nitrate of silver in water, in accordance with a certain specification, deposits silver at the rate of 0.001118 of a gramme per second.
Pàgina 360 - See f/stop. focal length When the lens is focused on infinity, it is the distance from the optical center of the lens to the focal plane. focal plane The plane on which a lens forms a sharp image. Also, it may be the film plane or sensor plane.
Pàgina 156 - But it indirectly feels the pressure of the air on the surface of the water in the open vessel, and it is this pressure that sustains the water in the jar. But the rubber bottom of the jar B yields somewhat to the downward pressure of the air, and is forced inward.
Pàgina 264 - The vast influence which the ocean must exert, as a moderator of climate, here suggests itself. The heat of summer is stored up in the ocean, and slowly given out during the winter. This is one cause of the absence of extremes in an island climate.
Pàgina 304 - The total energy of any body or system of bodies is a quantity which can neither be increased nor diminished by any mutual action of such bodies, though it may be transformed into any one of the forms of which energy is susceptible.
Pàgina 306 - When equal quantities of mechanical effect are produced by any means whatever from purely thermal sources, or lost in purely thermal effects, equal quantities of heat are put out of existence or are generated.
Pàgina 489 - As a unit of electro-motive force, the international volt, " which is the electro-motive force that, steadily applied to a " conductor whose resistance is one international ohm, will '• produce a current of one international ampere...

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