Smithsonian Miscellaneous Collections, Volume 71, Issue 1Smithsonian Institution, 1920 - Science |
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Common terms and phrases
acid alcohol Alloys Aluminum ampere annealed Antimony atomic average axis Bismuth Brass Bureau of Standards Cadmium Carbon Cast Chem chloride cm³ coefficient compressive strength constant Copper cubic centimeter density diameter dimensional formula dioxide Drawn hard electric electromotive force elongation Ethyl Ethyl alcohol g/cm³ gases glass grams gravity H₂O Hydrogen Inch iron kg/mm² kg/mm² lb/in² lb/ft³ lb/in² lb/in² Per cent length liquid magnetic measured MECHANICAL PROPERTIES mercury metal meters metric Modulus of elasticity Nickel nitrate Phys Pinus Platinum quantity radiation ratio resistance Rolled salt Silver SMITHSONIAN TABLES solution specific gravity square STANDARD GRAVITY steel Substance sulphate Sulphur Temp temperature tensile strength Tension tests thickness Tungsten U. S. Navy Ultimate strength units vapor pressure velocity viscosity Wave-length weight Wied wire Zinc ΙΟ
Popular passages
Page xxxvii - 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.
Page xxxvii - 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.
Page xxxvii - Henry, which is the induction in a circuit when the electro-motive force induced in this circuit is one international volt while the inducing current varies at the rate of one Ampere per second.
Page xxxvii - The international -watt is the energy expended per second by an unvarying electric current of one international ampere under an electric pressure of one international volt.
Page 435 - As a unit of electromotive force, the international volt, which is the electromotive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of one international ampere...
Page 6 - ... bars. These standards of weight and length were intercompared, without preference, and certain ones were selected as International prototype standards. The others were distributed by lot, in September, 1880, to the different governments, and are called National prototype standards.
Page xxxvii - As a unit of quantity, the international coulomb, which is the quantity of electricity transferred by a current of one international ampere in one second. " As a unit of capacity, the international farad, which is the capacity of a condenser charged to a potential of one international volt by one international coulomb of electricity.
Page 435 - The International Volt is the electrical pressure which, when steadily applied to a conductor the resistance of which is one international ohm will produce a current of one international ampere.
Page xxxvii - As a unit of work the joule, which is equal to io7 units of work in the CGS system, and which is represented sufficiently well for practical use by the energy expended in one second by an international ampere in an international ohm.
Page xxvi - T being of three dimensions in space. In passing from one part of the spectrum to another X is the only quantity which varies, and we have the important law: " When light is scattered by particles which are very small compared with any of the wavelengths, the ratio of the amplitudes of the vibrations of the scattered and incident light varies inversely as the square of the wave-length, and the intensity of the lights themselves as the inverse fourth power.