Electric Lighting: A Practical Exposition of the Art, for the Use of Engineers, Students and Others Interested in the Installation Or Operation of Electrical Plants, Том 1D. Van Nostrand Company, 1904 |
Загальні терміни та фрази
advantage air-gap alternating current amount ampere-turns amperes arc lamps arc lighting armature core arrangement belt boiler brushes carbon cause cell cent central stations centrifugal force Chapter circuit coal coils commutator condensation conductors connected consists construction copper cut-off cylinder diameter direct direct current direct-current discharge dynamo eddy currents effect efficiency elec electric lighting electric-lighting employed engine fact feet field field-magnet flux density fly-wheel fuel gas-engine governor heat hence high-speed hysteresis incandescent lamps increase inductors insulation iron isolated plants latter lines load machine magnetic magnetic circuit mechanical mercurous sulphate motors multipolar obtained operated ordinary pipe piston plates pole-pieces poles practically pressure produced represented in Fig resistance revolutions per minute ring shaft shown in Fig slot sparking speed steam steam-engine storage battery stroke sulphate supply surface temperature tion tubes turbine usually valve vertical voltage volts weight wheel winding wire zinc sulphate
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Сторінка 6 - 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.
Сторінка 6 - First. The unit of resistance shall be what is known as the International ohm, which is substantially equal to one thousand million units of resistance of the centimeter-gram-second system of electro-magnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice fourteen and four thousand...
Сторінка vii - When pieces of charcoal about an inch long and onesixth of an inch in diameter, were brought near each other (within the thirtieth or fortieth part of an inch) a bright spark was produced, and more than half the volume of the charcoal became ignited to whiteness, and by withdrawing the points from each other a constant discharge took place through the heated air, in a space equal at least to four inches, producing a most brilliant ascending arch of light, broad, and conical in form in the middle.
Сторінка 6 - 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.
Сторінка 314 - If the three lamps simultaneously become dark or bright, the connections are correct, and the three switches may be closed at an instant of darkness. It may happen, however, that the lamps do not become bright or dark simultaneously but successively This indicates that the order of connection of the leads of one machine does not correspond with that of the other. In this case, transpose the leads of one machine until the proper or simultaneous action of the lamps is obtained. After the machines have...