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International ELECTRONIC SOURCES
Programming Scientific Calculators. by J.
Wegstein and S. Alexander. "Con. Eng." May
1956. 6 pp. Procedures for programming a
problem on a computer are given. The problem
is represented by a flow diagram and coded
into a form which the computer can understand.
An illustration is given of a problem
solved on the NORC. Source 6/6 -128
Compound Modulation Improves Data Storage.
by R. Bentley. "Con. Eng." May 1966. 2 pp.
Compound modulation (a combination of suppressed
carrier AM with FM) is indicated to
be an improved method of recording data on
tape for storage. Comparison with FM is made.
and advantages shown. Source 6/6 -129
Error Analysis Proves Digital -to- Analog Conversion
Can Be Precise, by F. Bradley. "Con.
Eng." May 1956. 2 pp. Error analysis of a
relay operated voltage divider is given. Resistor
accuracy, shorting resistance, transient effects,
and calibration error are covered. Source
6/6 -180
Transistor Circuits for Digital Computers, by
D. Deuitch. "EL" May 1956. 2 pp. Application
of transistors to computer circuits such as flip -
flops, gates, counters, pulse amplifiers, etc., is
discussed. Both junction and point- contact
transistors are considered. Source 6/6 -131
Principles and Application of Electronic Analogue
Computers (Part 3), by P. Beggs. "El.
Eng." May 1856. 4 pp. In this part, design considerations
pertaining to 2 computer units are
discussed, followed by a consideration of the
completed computer. Source 6/6 -132
(ThD
CONTROLS
Frequency -Responsive Speed Control, by R.
Weber. "Con. Eng." May 1956. 2 pp. The output
frequency of an ac generator is measured
on a frequency -responsive tachometer to indicate
speed. Control signals which are independent
of voltage variations are obtained. Source
6/6 -133
Direct or Reverse Controller Actions ?, by G.
Platt. "Con. Eng." May 1956. 8 pp. Two charts
are given which specify selection for cascade
control. Temperature and level control systems
are considered. Source 6/6 -134
How to Find Controller Settings from Process
Characteristics, by G. Coon. "Con. Eng." May
1956. 11 pp. Procedures and charts for determining
and adjusting controllers are given.
Controller action and recovery are discussed.
Source 6/6 -185
Consider Using Hybrid Amplifiera, by G.
Attura. "Con. Eng." May 1956. 6 pp. The
hybrid amplifier uses semiconductor diodes,
transistors, and magnetic toroida in conjunction
with vacuum tube amplifiers as a means
of widening the applications of control amplifiers.
The system characteristics of a few of
these hybrids are outlined. Source 6/6 -136
Be Sure to Consider Human Dynamics, by N.
Avrech. "Con. Eng." May 1956. 3 pp. A discussion
of the displacement and force characteristics
of a control lever which best fit average
human responses. Source 6/6 -137
The Definition Of Regions Of Stability And
Equal -Damping Lines By Means Of The
Logarithmic- Frequency -Control Method, by N.
Kusovkov. "Avto. i Tel." Feb. 1956. 7 pp. The
paper shows how the method of logarithmic
frequency responses can considerably decrease
the difficulty of constructing the boundaries
for regions of stability and lines of equal
damping. The advantages of this method over
the D- breakdown method are analyzed, particularly
for high -order characteristic equations.
Models and nomograms are used in place
of tedious mathematical computations. Source
6/6 -138
Comparison Of Some Typical Circuits For
Magnetic Amplifiers With Internal Feedback.
by A. Gorodeteky. "Avto. i Tel." Feb. 1956. 13
pp. The parameters of an ordinary amplistat
and a Ramey amplifier are compared. It is
proven that these amplifiers are fully identical
as far as their time characteristics are concerned.
The author classifies various types of
magnetic amplifiers and determines their basic
parameters. Suggestions are made concerning
methods of increasing the zero-stability of reversible
magnetic amplifiers. Source 6/6 -257
A Push -Pull Magnetic Amplifier With DC Output,
by R. Balyan. "Avto. i Tel." Feb. 1956.
12 pp. The paper examines a new circuit for
a push -pull magnetic amplifier designed to control
a dc load. The basic relationships for designing
the circuit parameters are given, and
are compared to the parameters of the more
common known circuits. The features arising
during the operation of a dc motor are briefly
analyzed. A series of steady -state and transient
characteristics are given for the circuit, The
given circuit is compared to a rotary amplifier.
Source 6/6 -139
The Reaction of a Voltage with a Linearly -
Varying Frequency upon Linear Systems, by S.
Khlytchev. "Radiotek." Jan. 1956. 12 pp. A
method is given for investigating transients
which arise due to the reaction of a voltage
with a linearly- varying frequency upon linear
systems. On the basis of a general solution for
the problem, dynamic frequency characteristics
are obtained for an n -stage tuned amplifier
with single tuned circuits. The solution for a
system with a "limiting" transfer coefficient is
also given. Graphs are given which describe
the degree to which the frequency- variation
rate of the impressed e.m.f. distorts the shape
of the frequency response. Source 6/6 -140
Servomechanism Simulator, G. Weitner. "El
Rund." Apr. 1956. 2 pp. It is proposed to study
the operation of a servomechanism by simulating
circuitry performing all essential function
of the servomechanism. The performance of
the circuitry is observed on a CRO. Source
6/6 -141
Determination of the Amplitude Distribution
on Plane Surfaces from the Directional Radiation
Pattern, by K. Feher. "Are El. Uber." Mar.
1956. 7 pp. The distant radiation pattern permits,
by a Fourier analysis, the determination
of the amplitude distribution. An experimental
method is described. The method is applicable
in ultrasonics. Source 6/6 -142
Reflection of Ultra -Short Waves From Layer -
Anhomogenieties of the Troposphere, by V.
Troitaky. "Radiotek." Jan. 1956. 10 pp. Various
causes for the appearance of layer- anhomogenieties
in the troposphere are examined. Formulas
are given for determining the reflection
coefficients of radiowaves from layer- anhomogenieties
for angular incidence upon various
layer forms. The paper examinee the role
played by reflection in the propagation of
ultra -short waves over distances far beyond
the line of sight. Source 6/6 -148
Parabolic Cylinder Aerials, by K. Foster.
"Wirel. Eng." Mar. 1956. 7 pp. Consideration
is given to the details of the broad radiation
pattern of the parabolic -cylinder type of aerial.
An approximate theory is developed which
yields the beam- widths and general shapes of
these patterns and design criteria are estab-
lished. The theory is shown to be accurate
enough for design purposes. Source 6/6 -144
The Propagation of Electromagnetic Waves Between
Two Round Cylindrical Surfaces in the
Presence of Longitudinal, Periodically- Located
Diaphragms, by E. Solovyov. "Radiotek." Jan.
1956. 4 pp. The paper examines the propagation
of electromagnetic waves between two
round cylindrical surfaces in the plane r, 0 in
the presence of longitudinal diaphragms, located
periodically with respect to b. The problem
is solved by the method of "interlacing"
the fields at the boundary of the two regions.
The longitudinal electric field is approximated
according to the traveling -wave law. The dispersal
equation for constant propagation is obtained.
Source 6/6 -145
Graphical Determination of the Characteristics
of Automatic Control Systems from Their
Transient Response, by W. Luhr. "AEG Prog."
No. 4, 1956. 5 pp. From the characteristics of
the individual components of the control system
and their variation and relation with the
disturbances which arise, the various operating
points of the control system in the final steady
state are derived. Conclusions then may be
drawn as to the variation of the controlled condition
referred to the disturbances affecting the
system. Source 6/6 -146
Application and Theory of Proportional Control
of Temperature, by H. Eggers. "AEG Pros."
No. 4, 1955. 9 pp. A theory is developed which,
in addition to transfer and distance velocity
lags, takes account of the proportional band,
heat input and output, and also the dead time
of controller and regulating unit and the magnitude
of disturbances to be compensated.
Means of achieving maximum accuracy of control
without hunting are illustrated. Proportional
control is compared with 2-step control.
Source 6/6 -147
Voltage Regulator With Magnetic Amplifier and
Disturbance Injection for Use With Single and
Three -Phase Alternators With Exciters, by W.
Blase. "AEG Prog." No. 4, 1955. 7 pp. Article
describes a system of voltage control for medium
and large sized alternators which employs
magnetic amplifiers and disturbance injection
to carry out the appropriate control action.
Operation is explained with the use of circuit
diagrams and oscillograms. Source 6/6 -148
Motor Generators With Electronic Control for
Voltage and Frequency Stabilization, by E.
Schone. "AEG Prog." No. 4, 1955. 10 pp. Control
circuits using electronic means for stabilizing
the voltage and frequency of test bench
generators are described with reference to the
performance usually required from this type of
equipment. Practical examples are given.
Source 6/6 -149
Electrical Technology and Automatic Control
Engineering, by O. Grebe. "AEG Prog." No. 4,
1865. 8 pp. Using a temperature equipment as
an example, the characteristic features of an
automatic control system are brought out. The
importance of regulation technique in automation,
especially in processes which previously
have been operator controlled, is discussed and
the functions of electrical circuit components
indicated. Source 6/6 -160
The Basic Principles of Automatic Control Explained
by the Example of Automatic Voltage
Regulation, by A. Hochrainer. "AEG Prog."
No. 4, 1955. 11 pp. A voltage controlled de shunt
generator is used to explain the essential concepts
and terminology of automatic process control.
A comparison of the theoretical and practical
approach to the solution of any particular
problem is discussed. Source 6/6 -161
The Concepts and Terminology of Automatic
Control, by O. Blaum and R. Dehmlow. "AEG
Prog." No. 4, 1956. 12 pp. Concepts and terminology
applicable to automatic control are
132
Tele -Tech & ELECTRONIC INDUSTRIES June 1956