Wireless Telegraphy and Telephony: A Handbook of Formula, Data and Information |
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Common terms and phrases
ABAC adjusted aerial alternating current amperes amplitude anode antenna apparatus atmosphere bakelite c.g.s. units capacity carbon cathode cent centimetre charge choking coils circuit circular coefficient coil condenser conductor connected constant Constantan copper coupling cube cubic curve cylinder density detector diameter dielectric strength direct current disc discharge distance earth effect electric electrodes electromagnetic energy equal equation filament formula given grid high frequencies inches inductance insulated ionisation iron joules Kilovolts loge Manganin Marconi mast maximum mercury metal method metres microphone negative resistance Nickelin obtained ohms oscillations oscillatory parallel plane plate Poulsen arc primary quenched radiation radius ratio reactance receiving resistance resonance rotor secondary shown in Fig shunt signals solenoid spark square station strays surface Table telephone temperature transformer tube tuning unit length varying velocity vibration voltage volts watts wave-length waves winding wire wireless وو
Popular passages
Page 15 - 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 503 - Radian is the angle subtended, at the centre of a circle, by an arc equal in length to the radius...
Page 15 - ... 3. 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. 4. 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 15 - 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 152 - This fact may be due to the passage of the waves over Cuba, or to other conditions of transmission in this portion of the world. The receiving work at Colon was done by Chief Electrician Meneratti, assistant at the naval radio laboratory. The receiving apparatus used consisted of a Federal receiving set, which is especially efficient at the longer wave lengths, a slipping contact detector, and a Fessenden heterodyne. The regular...
Page 463 - By the use of 2,000 cycle alternating current instead of 60 cycle, it is possible to store up large quantities of energy and thus obtain as much as a kilowatt or more of power in the form of direct current with condensers of moderate size. This high voltage direct current is then used, as before, to operate a pliotron...
Page 337 - ... Under these conditions, only a small fraction of the electrons escaping from the cathode reach the anode, whereas the majority of them are repelled by the electrons in the space and therefore return to and are absorbed by the cathode. From this viewpoint it is evident that if a negatively charged body is brought into the space between the anode and cathode, the number of electrons which then return to the cathode will increase, so that the current to the anode will decrease. On the other hand,...
Page 15 - ... gramme are meant the standards of those denominations deposited with the Board of Trade. 3. That the standard of electrical resistance should be denominated the ohm, and...
Page 15 - The International volt is the electrical pressure which, when steadily applied to a conductor whose resistance is one International ohm, will produce a current of one International ampere. IX. 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 337 - In a pure electron discharge, as the temperature of the filament is raised, a point is always reached where the current becomes limited by the space charge between the electrodes.