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Proceedings of the IEE - Part IV: Institution Monographs

Issue 7 • Date August 1954

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Displaying Results 1 - 18 of 18
  • Discussion on ¿Equivalent circuits for transformers and machines including non-linear effects¿

    Publication Year: 1954
    IEEE is not the copyright holder of this material | PDF file iconPDF (131 KB)
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  • Transient Theory of Synchronous Generators under Unbalanced Conditions

    Publication Year: 1954, Page(s):166 - 182
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2216 KB)

    The paper contains a mathematical theory of the operation of a synchronous generator after the closing of a switch at its terminals, under the assumption that the speed remains constant after the change. The theory is first formulated for the general case where the external circuit consists of any unbalanced impedances and source voltages. It is then applied to the three well-known conditions of u... View full abstract»

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  • Spaced-receiver experiments on radio waves of 19-km wavelength

    Publication Year: 1954, Page(s):183 - 186
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (532 KB)

    The signals from the Post Office sender GBR at Rugby on a frequency of 16 kc/s (wavelength 19 km) were received at a distance of about 100 km at two sites whose distance apart was, on one occasion, 15 km, and on another occasion 40 km. Examination of the fading records of the amplitude of the wave reflected from the ionosphere showed that it consisted of a steady component on which was superimpose... View full abstract»

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  • The design of an electrodynamic multiplier

    Publication Year: 1954, Page(s):187 - 191
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (593 KB)

    An electric-analogue multiplier using an electrodynamic principle is described. An output voltage proportional to the continuous product of two rapidly varying voltages is obtained by the use of crossed electric and magnetic fields in a cathode-ray tube, in conjunction with a photo-electric feedback system. The systematic error in the output is not greater than 2% of maximum output in the frequenc... View full abstract»

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  • Synthesis of ladder networks to give Butterworth or Cheb¿shev response in the pass band

    Publication Year: 1954, Page(s):192 - 203
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1142 KB)

    Simple formulae are derived for the design of low-pass ladder networks to give Butterworth or Cheb¿shev response in the pass band. These hold for any distribution of load between input and output circuits. Useful expressions are given for the input impedance and reflection coefficient. For networks with more than three branches there are multiple solutions which can be separated by information ob... View full abstract»

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  • Transmission-line estimations by combined power circle diagrams

    Publication Year: 1954, Page(s):204 - 208
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (547 KB)

    Power circle diagrams drawn for either sending or receiving ends of a transmission line do not have a common centre for the voltage circles, nor are the power axes within the same semicircle. There is also a possibility of confusion over the sign of reactive power when conditions at both ends of the line are estimated by means of separate diagrams. A quadrant diagram with current taken as referenc... View full abstract»

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  • The reflection of electromagnetic waves from a rough surface

    Publication Year: 1954, Page(s):209 - 214
    Cited by:  Papers (24)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (667 KB)

    The scattering and reflecting properties of surfaces which are perfectly conducting but which have random irregularities are investigated in a statistical manner. The surface is assumed to be not too precipitous. With a statistical model for the surface, the scattering of light by a disturbed water surface is considered, and the method is used to calculate the amount of sea clutter observed in cen... View full abstract»

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  • On cavity resonators with non-homogeneous media

    Publication Year: 1954, Page(s):215 - 218
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (480 KB)

    Perturbation theory is used to find the frequencies of oscillation and Q-factors of a cavity containing a medium for which the permittivity and the permeability are arbitrary functions of position. The theory is applied to an H011 cylindrical cavity containing a disc of dielectric which does not extend over the complete cross-section of the cavity. View full abstract»

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  • The zero-sequence parameters and performance of three-phase induction motors

    Publication Year: 1954, Page(s):219 - 224
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (684 KB)

    The authors have already demonstrated1 that zero-sequence currents can produce a finite torque in a 3-phase induction motor, and that it is the predominant component torque in certain cases of asymmetrical connection. The present paper shows, for the first time, how the relevant parameters for zero-sequence operation may be determined from certain test results, and how they may be utilized to pred... View full abstract»

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  • The excitation of plane surface waves

    Publication Year: 1954, Page(s):225 - 234
    Cited by:  Papers (18)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1168 KB)

    It is shown that a surface wave will be generated by a horizontal slot situated above a corrugated or dielectric-coated guiding surface. A physical interpretation of the analysis is suggested which explains the mechanism of launching in terms of a resonance phenomenon allied to that which arises when a piston attenuator is terminated by a reactance equal and opposite to its own (reactive) characte... View full abstract»

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  • Ray-path characteristics in the ionosphere

    Publication Year: 1954, Page(s):235 - 249
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1712 KB)

    The paper is based on an earlier one by the author1 and presents an improved method of making magneto-ionic calculations that is both quicker and more accurate than the graphical construction previously given. By means of a new parameter the symmetrical cases can be studied in a simple manner and the asymmetry in the general case can be more readily examined. Propagation in the magnetic meridian p... View full abstract»

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  • An absolute measurement of resistance by Albert Campbell's bridge method

    Publication Year: 1954, Page(s):250 - 257
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1116 KB)

    Two determinations of the unit of resistance in terms of mutual inductance and frequency were made during 1951 using Campbell's bridge method. They gave the same value within 1 part per million, and the mean value agreed with that found in 1936 to the same accuracy. The value obtained for the ohm as maintained by the group of coils forming the reference standard at the National Physical Laboratory... View full abstract»

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  • Improved Matrix and Determinant Methods for Solving Networks

    Publication Year: 1954, Page(s):258 - 265
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1018 KB)

    It is shown that a linear electrical network, which may include valves and transformers, can be represented topologically by a network composed entirely of elements of a single type. In its most general form an element of this type comprises four nodes and two directed branches. It is also shown that a linear electrical network can be represented algebraically by a matrix, termed an H-matrix. If t... View full abstract»

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  • The suppression of switching transients by a shunt RC circuit

    Publication Year: 1954, Page(s):266 - 270
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (450 KB)

    When apparatus incorporating shunt capacitance is suddenly switched across a low-impedance source of power through a short transmission line, an oscillatory transient over-voltage normally results. It is common practice to reduce this over-voltage by placing an RC circuit in parallel with the terminal apparatus. The behaviour of such a circuit is analysed in detail, and the conditions for the tran... View full abstract»

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  • The ¿unit¿ treatment of impedance irregularities and its application to long lines

    Publication Year: 1954, Page(s):271 - 289
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2079 KB)

    The paper gives a statistical treatment of line irregularities in which the correlation theory is briefly surveyed, and describes in detail an alternative treatment using ?unit irregularities,? which yields equivalent results. The reflection and transmitted echo coefficients are derived for families of lines, and it is shown that whilst the latter generally add on a random basis and increase with ... View full abstract»

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  • The solution of a certain differential equation. Its usefulness in a particular application of silicon-carbide resistors

    Publication Year: 1954, Page(s):290 - 299
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1340 KB)

    The paper is concerned primarily with developing a particular method of obtaining an approximation to the periodic solution of the equation ?ay3dx+By = sin ?x. This equation arises in the problem of a capacitor in series with a resistor having a characteristic i au3, when connected to a source of simple harmonic voltage. The problem is first converted into a modified one which is as follows: If th... View full abstract»

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  • Discussion on ¿The design of a radio-frequency coaxial resistor¿

    Publication Year: 1954
    IEEE is not the copyright holder of this material | PDF file iconPDF (156 KB)
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  • Discussion on "The return-difference matrix in linear networks"

    Publication Year: 1954, Page(s):299 - 300
    IEEE is not the copyright holder of this material | PDF file iconPDF (270 KB)
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