Radio Engineering Principles (Google eBook)

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McGraw-Hill book comapny, 1919 - Radio - 300 pages
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Page 144 - ... where e is the base of the natural system of logarithms, and where i is a rate of interest to be defined in Section III and IV.
Page 23 - The practical unit of capacitance is the farad, which is the capacitance of a condenser which will store one coulomb when the potential difference across its terminals is one volt.
Page 15 - ... that we join together the two distinct forms of protoplasm, the nucleus and the cytoplasm, albeit in the correct proportions, for no protoplasm is thus formed which has the property of life. While other chemical compounds can be formed by combining their elements in the correct proportions, (eg one molecule of water is made up of one atom of oxygen and two atoms of hydrogen) the life-giving matter which is the main constituent of a human being's body can in no way be brought into existence by...
Page 147 - Brcos6rNrdr rotations for the two-way path, (1) 222 ' where e and m are the charge and mass of an electron, c is the velocity of light and / the frequency of the radio waves.
Page 36 - The result of such an impulsive force depends not only on the magnitude of the force but also on the duration of the action, even if this is very short.
Page 75 - ... not to mutilate the page, the scale may be copied. This scale gives accurate results if the capacity scale is so set that its indications are proportional to the capacity in the circuit. A measurement of decrement is made by first observing the current-square at resonance, then reading the decrement scale at a setting on each side of resonance for which the current-square FlG. 135. Direct-reading decrement scale for any semicircularplate condenser is one-half its value at resonance. The difference...
Page vii - FOREWORD I am greatly pleased with the manuscript of " Radio Engineering Principles" and recommend it as a work which brings the study of this important subject up to date. It covers fully and clearly without too great use of mathematics, the theory involved in the wonderful developments in the Art of Radio Communication made during the war, except for certain reservations which it is not possible to release at this time.
Page vii - Chief ^Signal Officer of the Army. War Department, Office of the Chief Signal Officer...
Page 146 - Due to the steady stream of electrons passing from the filament to the plate, there are at any instant a number of electrons in the space between the filament and the plate. These electrons all move toward the plate and are absorbed by it, but, at the same rate, new electrons are emitted by the filament so that the number of electrons present at any moment in the space between the...
Page 145 - ... not cause any increase of the plate current, since if the plate is attracting all of the electrons as fast as they are given off by the filament, it cannot attract a greater quantity unless the filament is made to give off more electrons per second by increasing its temperature. This maximum plate current, beyond which there is no increase for increased plate potential, is known as the saturation current of the tube, for the corresponding filament temperature and plate voltage. For any given...

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