Engineering Commons^™

A Study Of Radio Frequency Converters And Mixers, James J. Skiles

Masters Theses

"This thesis will present a detailed discussion of the principles of frequency conversion and the problems attendant to the design of converter stages. The topic of harmonic conversion has been singled out for a more extended treatment than is now available in the literature. This topic is the subject of the experimental investigation portion of this thesis. Harmonic conversion has applications in U-H-F receivers as well as in "Double Superheterodyne Receivers".

The discussion given to the frequency converter in the first section of this thesis will be without regard to any applications. General theory will be stressed, and most of …

Design Of A Steam Power Plant To Be Erected In Mudanya, Turkey, Vahram Ogretmenoglu

Masters Theses

"The power plant, the design of which is submitted herewith, is to be erected in Turkey, at the center of the town of Kestik, in the district of Mudanya along the shores of the Marmora Sea. Mudanya is the harbor of the state of Brusa, and like most of the big cities, it is entirely electrified. However, electrification in Turkey has begun in the late twenty's; consequently, it has not yet been possible to bring electricity to the numerous small towns and villages. Several big projects have been undertaken for purposes of rural electrification, one of them being the erection …

Problems In Theatre Lighting And Pre-Selective Elctronic Lighting Control, Hasan Orhan Aker

Masters Theses

"Until the recent years, because of the lack in technical know-how of play producers and on the other hand the limited knowledge of the engineers about stage technique, all the advantages provided by efficient stage lighting could not be exploited. Especially, the different problems encountered from the point of view of lighting control, could not be solved for a long time.

It has been proven from theatres built lately, that the stage lighting designs made without a thorough study of the various stage conditions and requirements lead to a tremendous increase in cost and also inefficient operation of the whole …

A Theoretical And Experimental Analysis Of Delay Circuits, Shuh-Tuh Tsai

Electrical and Computer Engineering ETDs

A delay circuit is a circuit which produces rectangular pulses of specified duration.

A rectangular pulse consists of three parts: first, a sudden rise of voltage; second, remaining a constant voltage during a certain time interval; and third, a sudden drop of voltage to its original value.

If the sudden rise of voltage at t, is produced by a certain sudden action of a circuit previous to the pulse circuit, the sudden drop of voltage at t₂ can cause another circuit to produce a sudden action. Thus, the second action is produced by the first action at a time …

An Experimental Investigation Of Multivibrators, Harry W. Gates

Electrical and Computer Engineering ETDs

The object of this study is two-fold. The first part of the investigation is concerned with substantiating experimentally the mathematical analysis for the conventional multi-vibrator and to derive similar expressions for the grid return multi-vibrator. The second purpose of this investigation is to delve into several possible ways of improving the linearity and thereby the frequency division usefulness of the multi-vibrator.

Calculations Of Maximum Sag Of A Transmission Line With An Ice Load On One Span, Rodney A. Schaefer

Masters Theses

"An important problem concerning electric power lines is the calculation of the maximum sag occurring when there is an ice load on only one span. The object of this thesis is to determine a practical method for calculating the maximum sag of a transmission line, suspended on suspension insulators, with the aforementioned loading conditions. This paper is limited to the case where the supports of the transmission line are at equal elevations and all span lengths are equal"--Introduction, page 1.

Pulse Ratings And Thermal Characteristics Of Power Transistors, Christopher Jako

Electrical and Computer Engineering ETDs

Power transistors are used in switching circuits of various types. Their operation in these circuits can be considered as an essentially on-off operation. Designers working with these circuits found that the ratio of the on-time to the off-time is a critical factor in determining the average power that the transistor can dissipate without exceeding its inherent temperature limits.

An Investigation Of An Electronic Ignition System For Internal Combustion Engines, Richard David Wheat

Masters Theses

"Many types of electric ignition systems have been developed, used, and discarded in favor of systems less expensive and more adaptable to internal combustion engines, Two types which might be classified as high-tension, jump-spark systems are in common use today. These two systems are (1) Battery-coil ignition used mainly on automobiles, and (2) Magneto-ignition used extensively on aircraft engines. A considerable amount of work has been done to determine the extent to which the character and intensity of the electric spark affect the ignition process. This work has revealed that a certain minimum amount of energy is required from the …

Design And Construction Of An Electronic Gain-Phase Meter, Gabriel G. Skitek

Masters Theses

"There are many communication and electronic circuits, such as filters, phase-shifting networks, matching networks, voltage amplifiers with and without feedback, whose proper usage with associated equipment depends upon the knowledge of the variation with frequency of the voltage ratio and phase angle between the output and input sinusoidal voltages or currents...It is the purpose of this thesis to design and build an electronic instrument that will measure the voltage gain and phase angle between two sinusoidal voltages or current of communication circuits, in such a manner as to aid the student in visualizing how these quantities vary with frequency, and …

A Study Of Cathode Drift Compensation In D-C Amplifiers, Joseph W. Rittenhouse

Masters Theses

"The expression, cathode drift, has to do with the random variations in vacuum tube plate current which are attributable to similar variations in emission velocities of electrons leaving hot cathodes. The fact that these random current changes appear to result from spurious drifts in cathode potential, since all other electrode potentials are unrelated to them, give rise to the expression, cathode drift...The problem with which this paper is concerned is a study of some of the possibilities of compensating for cathode drift effects in a single amplifier stage. Specifically, this paper will: (A) present a detailed mathematical and graphical analysis …

Analysis Of Cascade Of Four-Terminal Networks, Ernest Randolph Roehl

Masters Theses

"The object of this thesis is to find analytic expressions for the voltage and current variations along a structure composed of a cascade of identical dissymmetrical four-terminal networks driven harmonically at the sending end and working into an impedance at the receiving end and an impedance that can be placed at any of the junctions along the cascade. The method of analysis that is applied is analogous to that used in solving the long-line problem. A transmission system usually consists of the line or cable itself plus numerous other links whose purpose it is to correct defects in the line …

Analysis Of Simultaneous Faults By The Method Of Symmetrical Components, Robert Marshall Montgomery

Masters Theses

"The object of this thesis is to present a method for the analytic determination of fault currents and voltages of a symmetrical three-phase system that is subjected to three simultaneous faults. The fault analysis is to be effected by the method of symmetrical components...Though relatively infrequent, simultaneous faults are important because relay systems, operating satisfactorily for single faults, may fail to isolate simultaneous faults. Therefore, it seems worthwhile to have in convenient form a method for calculating short-circuit currents and voltages caused by faults occurring at the same time at three separate and distinct points of a system. It is …

Design Of A Radio Broadcasting Station, John William Hamman

Masters Theses

"In the design of any piece of equipment, before any work whatsoever is done, a reason for developing the object must be apparent to all concerned. Any expenditure of time, labor and money must be properly justified before action can be taken. In the case of this paper, then, the reason for designing a broadcast radio station for the Missouri School of Mines & Metallurgy at Rolla, Missouri is twofold: First, to provide an additional instrument whereby instruction may be given to students interested in the study of radio; second, to supply the residents of Rolla and vicinity with entertainment …

Spot Welding Low Carbon Steel, Leonardo Gutierrez

Electrical and Computer Engineering ETDs

This investigation of spot welding on low carbon steel was undertaken to study the quality of welds under different welding conditions. Low carbon steel is one of the most readily weldable materials of all metals and alloys used in resistance welding processes. Its metallurgical structure is such that fusion between separate pieces may be accomplished in a broad range of temperatures, so that precise control of welding conditions is not necessary for producing a spot weld. Because of this ease in securing a weld, more and more of the many low carbon steel products are being spot welded. This makes …

Study Of The Method Of Geometric Mean Distances Used In Inductance Calculations, Harold Lockwood Seneff

Masters Theses

"The object of this thesis is to study the method of geometric mean distances as applied in the calculation of inductances of transmission line conductors and of multicircuit transmission lines. The thesis will consist of: (a) the derivation of some of the basic theorems and equations to be used, (b) the use of these theorems and equations in calculating the geometric mean distances of different transmission line conductors, and (c) practical application of geometric mean distances applied in the calculation of equivalent inductance of multicircuit transmission lines. The method of geometric mean distances as applied to individual conductors of single …

The Theory Of The Impulse Function For Oscillatory Mechanical And Electrical Systems, E. L. Hill

Journal of the Minnesota Academy of Science

No abstract provided.

Design Of A Submergible Seadrome Light--Universal Type--Suitable For Military Use In All Areas And For Transportation By Aircraft, Frederick Marion Mueller

Professional Degree Theses

"This thesis was written in consideration of problems arising in present day use of battery operated seadrome lights. The information contained has been compiled to explain the development of a radically new design in seadrome lighting. Use of a selected single lighted strip is the basis of the design. The seadrome light described is a submergible type and is essentially a modification and combination of the 100 watt beacon lights, used with the Type B-2 portable field lighting set; and the American Gas Accumulator Company Portable Lighting Set PAM-2. The beacon was modified in that it was made waterproof and …

Period Of Oscillation Of A Thyratron Circuit, R. B. Hastings, James Newcomb, Robert Tucker

Journal of the Minnesota Academy of Science

No abstract provided.

Rural Distribution Line Protection, William Henry Rollman

Professional Degree Theses

"Considerable attention has been given the problem of providing low load density rural territory with electric service. In order that such supply may be economically justifiable, distribution system construction and operating costs must be considerably lower than that prevailing in urban or other territory having better load factors. It is the distribution engineer's problem to design, construct, operate and maintain a distribution system to furnish adequate and economical electric service to this low load density rural territory. In general, the rural line involves not only the circuit itself, but also the station equipment including transformers and protective devices for both …

Vocational Training Of High School Students In Electricity, Harry Fredrick Kirkpatrick

Professional Degree Theses

"At various intervals during the past five years I have had to justify my training program, not only to others but also to myself. After careful study and thought I am convinced that the objectives or purposes of the training program can be classified under four major headings: 1. Intelligent Self Direction... 2. Social Adjustment... 3. Work Habits... 4. Knowledge and Skills"--Part I, page 3-4.

The Incandescent Lamp, E. F. Tenbroeke

Theses

A brief history of the development of the incandescent lamp.

The Use Of Activated Alumina For Reclaiming And Reconditioning Turbine, Transformer And Circuit Breaker Oils, Thomas Odie English

Professional Degree Theses

"Advancements during the past few years have provided oil manufacturers with ample reason to claim that good oils no longer wear out because of use, but that deterioration by various destructive agencies such as moisture, air, heat, oxidation, emulsification and electro-chemical action may have the effect of rendering the oil totally unfit for use"--page 1.

An Acoustical Investigation Of Parker Hall Auditorium At The School Of Mines And Metallurgy Of The University Of Missouri, John Douglas Martin

Masters Theses

"The auditorium in Parker Hall on the Missouri School of Mines campus has been noted locally for its poor auditory characteristics. At times in the past corrective treatment has been considered but no detailed or experimental data were gathered. In September of 1934 the writer was detailed under an FERA project to study the room and to determine the best method of correction"--Introduction, page 1.

Equations For The Ballistic Galvanometer, Robert H. O'Brien

Bachelors’ Theses

This thesis presents the development of the equations for the ballistic galvanometer. The subject was chosen because of its fascinating interest and because of the breadth of material included. The working out of the general equation required a comprehensive review of fundamentals in electricity and mechanics, swell as mathematics. The following features may be noted.

History Of The Thermionic Tube, Mary Liguoria Urbin

Bachelors’ Theses

My interest in the field of physics being that of electricity, I have been permitted to pursue this thesis in the field of thermionics.

The thermionic tube is one of vital importance not only in the field of radiotelegraphy and radiotelephony, but is of great value in the field of engineering and a vast asset in university and college laboratories. In fact, its advent has opened up a new era in many fields. H. J. Van Bijl terms is a "versatile talking bottle." In a paper of this nature only the important features can be stressed, and even here much …

A Study Of The Plating Prohibitive Properties Of Various Separators, Bruno J. Pozorski

Bachelors’ Theses

The problem of this thesis is to study the plating prohibitive properties of the various materials commonly used in the manufacturing of separators, and to indicate which material would be most serviceable and feasible in a separator. At one time positives and negatives were kept not more than 0.25 inches apart, with the idea of reducing the intervening layers of electrolyte, and, therefore, the internal resistance of the cell, as much as possible. It was, however, found that the output could actually be increased by putting the plates at greater distances, the fact being that the larger bulk of solution …

Design Of A 2 Hp Repulsion Start Induction Motor, Joseph Worley

Professional Degree Theses

"The Repulsion Start Induction motor comprises a wound field or stator of laminated structure and a wound armature or rotor whose coils are connected to a commutator upon which brushes bear and function during the starting period. This motor operates as a repulsion motor during the starting period and at a predetermined speed the short circuiting device actuates and short circuits the commutator. The motor then operates as an induction or squirrel cage type. The starting torque of this type of motor is exceptionally high, generally 300% to 400% of full load torque. Consequently this type of motor is regarded …

Electrodeposition Of Rubber Upon An Electrode By Means Of A Direct Current Of Electricity, L. F. Novotny

Bachelors’ Theses

The rubber industry may be said to be one of the most speedily developed industries in the world. This is due to a great extent to the fact that the first real interest in rubber as a material of commerce came in the advent of the automobile. It was in 1888 that an Irish horse doctor, John Boyd Dunlop, conceived the idea of tying a rubber tube around the wheels of his little son's velocipede. Within seven years of this event, a $25,000,000 corporation was manufacturing Dunlop tires.

Something may also be said here of the man who took the …

Economics Of Supplying Electric Service To Downtown Areas Under Various Methods Of Distribution, Pericles P. Stathas

Bachelors’ Theses

This thesis aims to present the problems involved in supplying electric service to downtown areas of high load density, with particular stress on the economies of rendering such a service. A considerable portion of the thesis is devoted to the new method of distribution, namely, the low-voltage A-C network.

Reglamento Para La Conservación Y Uso De Las Carreteras, República De Cuba. Senado.

Mario Diaz Cruz Pamphlets

At head of title: República de Cuba. Secretaría de Obras Públicas. Negociado de Caminos y Puentes.