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Transactions of the American Institute of Electrical Engineers, Part I: Communication and Electronics

Issue 4 • Date Sept. 1955

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Displaying Results 1 - 25 of 28
  • A portable telegraph bias and distortion measuring instrument

    Publication Year: 1955, Page(s):401 - 407
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1902 KB)

    IN THE modern telegraph system, signals are transmitted over various trunk facilities derived from wire lines or radio relay systems. The trunk telegraph channels furnish facilities between a number of switching centers located at strategic points throughout the country. These centers then distribute traffic to the local points of destination. In addition, various other services must be accommodat... View full abstract»

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  • An accurate electronic tracer for dynamic characteristics of magnetic materials

    Publication Year: 1955, Page(s):407 - 418
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3130 KB)

    THIS equipment makes possible the accurate determination of dynamic magnetic characteristics needed for advanced magnetic amplifier design. The hysteresis loop and the time functions of H, B, and dB/dt can be either measured point by point or continuously recorded on an x-y recorder by means of an automatic electronic a-c compensator which transforms the a-c signal for any given time instant into ... View full abstract»

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  • Temperature errors in a dragmagnet eddy-current disk type of tachometer indicator

    Publication Year: 1955, Page(s):418 - 422
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1232 KB)

    An analysis has been made of the factors producing temperature error in a dragmagnet eddy-current disk type of tachometer indicator. A new design for tachometer compensation is described and test results are presented. View full abstract»

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  • Relation of D-C magnetic properties of oriented 48-percent nickel-iron to magnetic-amplifier performance

    Publication Year: 1955, Page(s):422 - 427
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1122 KB)

    TO IMPROVE the characteristics of cores for magnetic amplifiers, it is necessary for the metallurgist to isolate and measure those properties under his control as a material producer. The performance of a completed core depends on many factors, not all of which reflect actual magnetic properties of the core material itself. Many methods1¿5 have been used successfully to measure core performance u... View full abstract»

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  • Voltage gain of a resonant dielectric amplifier

    Publication Year: 1955, Page(s):428 - 434
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1409 KB)

    The gain of the resonant-circuit dielectric amplifier can be obtained directly from the slope of a characteristic which is called the tuning curve. When the carrier voltage across the nonlinear capacitor is small, the shape of the tuning curve can be computed by linear circuit analysis. This paper considers the shape of the tuning curve when the carrier voltage across the nonlinear capacitor is so... View full abstract»

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  • Aluminum die castings for carrier telephone systems

    Publication Year: 1955, Page(s):434 - 439
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7412 KB)

    DIE casting has been aptly termed the shortest distance between raw material and finished part. It is defined as the process of producing accurately dimensioned, sharply defined, smooth-surfaced parts by forcing molten metal under pressure into metal dies or molds. The term is also used for the resulting casting. Aluminum parts produced by the die-casting process are used extensively in all kinds ... View full abstract»

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  • Analysis of nonlinear coupled circuits ¿¿ Part II

    Publication Year: 1955, Page(s):439 - 443
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (913 KB)

    IN A paper presented in 1954,1 the analysis of nonlinear coupled circuits was made by the method of high order phase planes or phase space. The simultaneous differential equations are first combined into one higher order differential equation and then solved by a method outlined in the previous paper and illustrated by two examples. However, when there are nonlinearities existing in both loops of,... View full abstract»

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  • Minimizing and mapping sequential circuits

    Publication Year: 1955, Page(s):443 - 447
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1169 KB)

    SHANNON'S original paper suggesting a modification of the classical Boolean algebra of symbolic logic to a form of switching algebra led to the development among switching and computer designers of many special techniques.1¿3 Recent interest in the field is rapidly developing methods well within the reach of the occasional switching engineer who finds a moderately complex relay circuit necessary ... View full abstract»

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  • A sine function resistor

    Publication Year: 1955, Page(s):447 - 450
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (868 KB)

    This paper describes a sine function resistor of rather unusual design. A linear resistance card bent to circular shape about an eccentric frame of very simple construction is employed to obtain a resistance variation that is within very close limits of true sine values. This resistor should find application in certain computer circuits, particularly in those of the balanced-bridge type. The same ... View full abstract»

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  • Impulse noise in narrow-band FM receivers

    Publication Year: 1955, Page(s):450 - 454
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1880 KB)

    THE relatively narrow band frequency modulation (FM) communication receivers utilized in mobile communication are subject to interference caused by impulse-type signals received in the antenna. Most of these signals are from automobile ignition systems, from both the vehicle containing the radio and surrounding vehicles. Such impulses are also obtained from a variety of other electrical equipment.... View full abstract»

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  • The movable core transformer as a pickup for industrial telemetering systems

    Publication Year: 1955, Page(s):454 - 462
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3475 KB)

    THE differential transformer is a transducer type of pickup in which mechanical displacement is converted into a proportional electric output by varying the mutual inductance between a primary winding and two secondary windings. The effect is a differential one so that motion of the core or rotor in one direction produces an increase in induced voltage in one secondary winding and a decrease in th... View full abstract»

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  • Basic problems in film pickup for television broadcasting

    Publication Year: 1955, Page(s):462 - 466
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2749 KB)

    FILM programs now constitute a very large percentage of television (TV) air time. One network alone uses film at the rate of about 9,000,000 feet per month. Many of the major programs are recorded, for reasons of convenience, timing, or historical record. Some of the smaller stations have begun their operations using nothing but recorded material for all programs. View full abstract»

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  • Engineering multistage diode logic circuits

    Publication Year: 1955, Page(s):466 - 475
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2096 KB)

    THIS article presents the method used for engineering the multistage diode logical function circuitry for a special-purpose computer employing exclusively semiconductor devices. Although the techniques used have been largely influenced by the devices available or being developed for the rest of the system, it is felt that these devices are typical of the general type of transistor device which may... View full abstract»

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  • The appraisal of delays in gate-type operation

    Publication Year: 1955, Page(s):475 - 485
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3042 KB)

    IN RECENT years, increasing use has been made of gate-type lockout circuits in telephone switching systems. When such circuits are employed, a certain amount of delay occurs before service is given to any of the components connected to the gate; as a matter of fact one of the purposes of the gate lockout circuit is to provide a reasonably equitable distribution of delays where delays are unavoidab... View full abstract»

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  • A precision torque balance for the measurement of small torques

    Publication Year: 1955, Page(s):485 - 490
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3313 KB)

    THE development and testing of torque motors for precision gyroscopes require the accurate measurement of the small torques developed. These are stall torques, and are measured at various angular positions of the rotor with respect to the stator. The magnitude of these torques is generally less than 50,000 dyne-centimeters (dyne-cm). View full abstract»

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  • Operational magnetic amplifier with audio-frequency transistor power supply

    Publication Year: 1955, Page(s):490 - 496
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1596 KB)

    RECENT papers have indicated a strong interest in the operation of magnetic amplifiers with carrier frequencies higher than the common power frequencies of 60 and 400 cycles.1,2 Much work has been carried out, e.g., on magnetic frequency multipliers that would be a possible source of power at higher frequencies.3,4 It is generally known that increased magnetic amplifier performance can be achieved... View full abstract»

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  • A transducer-type frequency meter

    Publication Year: 1955, Page(s):497 - 500
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (954 KB)

    INDICATING or recording frequency meters in the 1-per-cent commercial frequency class use various circuits to obtain their indication. In all these circuits the instrument mechanism forms part of the circuit. The cross-coil type, the moving-iron type and the vibrating-reed type all have mechanisms that are built specifically for these meters, and these mechanisms have very little other commercial ... View full abstract»

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  • High-frequency operation of self-saturating magnetic amplifiers

    Publication Year: 1955, Page(s):500 - 505
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2316 KB)

    THE supply frequency of magnetic amplifiers has been restricted largely to the readily available 60-cycle-per-second (cps) and 400-cps power sources. Recent developments in high-frequency power supplies which have ruggedness and reliability commensurate with magnetic amplifiers have made it practical to operate magnetic amplifiers at supply frequencies of over 400 cps. Several papers have describe... View full abstract»

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  • An improved detached-contact-type of schematic circuit drawing

    Publication Year: 1955, Page(s):505 - 513
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2233 KB)

    THE ever-increasing complexity of telephone and telegraph switching circuitry in the Bell System reached a stage, about 10 years ago, where many of the conventional type of schematic circuit drawings presented difficulties in training of personnel and maintenance. It then became necessary, for the more complex circuits, to prepare and maintain a separate series of drawings especially streamlined f... View full abstract»

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  • The design of a new 2-element single-disk polyphase meter

    Publication Year: 1955, Page(s):513 - 516
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1175 KB)

    A new 2-element single-disk polyphase meter has been designed which incorporates a novel method of compensation to correct for interelement interference and a new approach to the problem of providing means for calibrating the meter. The method used to provide compensation for interelement interference and the design of the adjusters for calibrating light load and phase balance are described. View full abstract»

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  • Measuring and recording atmospheric electrostatic potential

    Publication Year: 1955, Page(s):517 - 520
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1280 KB)

    Various means have been available for many years to measure electrostatic potentials with ever increasing sensitivity and with decreasing current requirements. Instruments such as the electroscope or the common laboratory electrostatic voltmeter have been developed to the point where they operate reliably, with an input resistance of the order of 1016 ohms and higher, but in general these extremel... View full abstract»

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  • A method of solving Mathieu's equation

    Publication Year: 1955, Page(s):520 - 525
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1359 KB)

    MATHIEU'S equation ${d^{2}y over dt^{2}} + (b - 2q cos 2t)y = 0 eqno{hbox{(1)}}$ is gradually becoming a very important equation in physics and engineering. It apparently first appeared in a paper by Mathieu1 on the vibration of an elliptic membrane. However, since that time it has made its appearance in many practical problems in the fields of mechanics, electricity and magnetism, sound, etc. Man... View full abstract»

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  • Magnetic flux density measurements in rotating machines

    Publication Year: 1955, Page(s):525 - 528
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2011 KB)

    The Hall effect in a semiconductor is utilized to measure the flux density in the air gap of a rotating machine under transient conditions of starting and loading. This method offers several advantages over the conventional exploring-coil generator. Measurements of the flux density in a synchronous converter were made to demonstrate its applicability. View full abstract»

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  • The interisland radio network of the Hawaiian Telephone Company

    Publication Year: 1955, Page(s):529 - 536
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4069 KB)

    TEN years of planning and 2 1/2 years of actual installation work recently came to completion when the Hawaiian Telephone Company placed new radio equipment in operation on the interisland circuit between the islands of Oahu and Lanai. This completed the entire network which now provides service to six major islands of the Hawaiian chain. View full abstract»

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  • Ticketfax transmitters and recorders

    Publication Year: 1955, Page(s):536 - 541
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3739 KB)

    PULLMAN space reservation tickets are now being rapidly transmitted from one place to another by Western Union's new Ticketfax system which employs facsimile transmitters and recorders designed especially for the purpose; see Fig. 1. Ticketfax is equipment engineered and designed by Western Union as a part of a reservation system developed by the Pennsylvania and New York Central Railroads. View full abstract»

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Aims & Scope

This Transactions ceased publication in 1963. The current retitled publication is  IEEE Transactions on Communications.

Full Aims & Scope