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explained and illustrated by examples. The distinction
between closed and open loop systems
is emphasized. Static and dynamic behavior of
plant and controller are discussed and the characteristics
of the various kinds of continuous
regulators are illustrated by examples. Source
6/6 -162
The Functional Representation of Automatic
Control Elements by Block Diagrams, by A.
Lang. "AEG Prog." No. 4, 1955. 12 pp. Irrespective
of the constructional form of the components
of a control system, the control elements,
the functions of these components, and
of the system as a whole, can be represented by
block diagrams. After a presentation of the
block diagrams of the most important elements,
the drawing of block diagrams for complete
control systems is illustrated by means of an
example. Source 6/6 -153
An Electronically Controlled Mains -Fed Rectifier
of Very High Voltage Constancy, by H.
Jaskula. "AEG Prog," No. 4, 1956. 4 pp. An
electronically controlled de power supply is described
of which the 300 v. output is maintained
constant to within ±0.002% over the
whole load range of 0 to 350 ma. Supply voltage
can vary by 15% and frequency by 20 %.
Source 6/6 -154
Selenium Rectifiers Controlled by Magnetic Amplifiers,
by F. Germann and E. Schroter. "AEG
Prog." No. 4. 1955. G pp. Electrical circuits
employing magnetic amplifiers can often be
employed with advantage for the automatic
control of the output of selenium rectifiers.
The circuit and operation of a magnetically controlled
rectifier are described and various applications
are discussed. Source 6/6 -155
The Control of Rectifiers by Means of Magnetic
and Electronic Amplifiers, by E. Golde and W.
Jentsch. "AEG Frog." No. 4, 1955. 6 pp. The
characteristic features of the 2 types of amplifiers
as regards their application to automatic
control, together with the characteristics of the
grid impulsing apparatus which is actuated by
the control amplifier, determine the design of
the control circuit, with a view to accuracy
and stability in operation. Improving stability
by means of phase advance networks and feedbacks
are described. Source 6/6 -156
The Impact- Momentum Equation in Servo Design,
by I. Ritow. "El. Mfg." May 1956. 7 pp.
This article, fifth in the "Servo Series," describes
a method of analysis particularly suited
to instrument servos. In the impact- momentum
method of servo analysis, the assumption is
always made that the load will oscillate. The
designer then compares impacts (torques) with
momentum to see if the assumed oscillations
can actually exist. Source 6/6 -243
INDUSTRIAL ELECTRONICS
Quality Control Of A Neutral Object, By An
Astatic Regulator, by V. Maslennikov. "Avto. i
Tel." Feb. 1966. 10 pp. A method is given describing
the control method for a neutral object
which can be described by a first -order
equation. A nonlinear law guaranteeing
aperiodic transients is introduced for an astatic
regulator containing a single sensitive element.
Linear methods are used, and stable motion is
related to the roots of the characteristic equation.
Source 6/6 -158
On Improving Dynamic Characteristics Of Industrial
Regulators By Means Of Feedback, by
V. Karibaky. "Avto. i Tel." Feb. 1956. 12 pp.
The paper examines one of the methods for
improving the dynamic properties of industrial
regulators used for regulating thermal aggregates
in the metallurgical, chemical, petroleum,
heat -power and other branches of industry.
Theoretical analysis is made of the effects of
various types of feedback. Source 6/6 -159
Automatic Control of Power Equipment for
Telecommunications and Other Essential Services,
by A. Watkins. "J. BIRE." Apr. 1956.
12 pp. Two types of no-break generating sets
are described: an all -electric battery operated
equipment and a diesel electric equipment.
Three electronic devices used with these sets
are described: a static exciter automatic voltage
regulator; an alternator synchronizer; and
a speed regulator using a thyratron. Source
6/6 -160
A Three -Dimensional Machine Tool Control System.
"El. Eng." May 1956. 4 pp. Description
of an electronic control system for a vertical
milling machine. An optical diffraction grating
system associated with each plane of the machine
tool is used for a measuring system.
Source 6/6 -161
Electronic Engraving, by S. Levine and A.
Welch. "J. EIRE." Mar. 1956. 8 pp. Machines
for producing half -tone printing plates are considered.
In particular the Scan -A- Graver developed
by Fairchild Camera and Instr. Corp..
U. S., the German -made Clichograph and the
Swiss -made Elgrama are explained. Tone correction,
reproduction of colored copy, and enlargement
and reduction of copy are studied.
Source 6/6 -162
Tone Reproduction with Electronically -Cut
Stencils, by R. Lant. "J. BIRE." Mar. 1956. 5
pp. The Roneo electronic stencil cutting machine
is capable of producing intermediate tone
values; the spark -discharge is electronically
controlled. The tone control arrangement for
matching the tones of the original and the
copy is given special attention. Source 6/6 -163
Electronics in the Process Industries, by J.
Carroll. "El." May 1956. 8 pp. New electronic
measuring and control devices are described
which are used in the automatic operation of
petroleum, chemical, and other continuous -flow
industries. Source 6/6 -164
Reduction of Minimum Striking Voltage of
Hydrogen Thyratrons, by A. Barrington. "El.
Eng." May 1956. 1 p. An auxiliary tripping
circuit is described by means of which a conventional
line -type pulse generator is modified
to deliver a continuously variable output from
0 to 20 kv. Source 6/6 -165
Stabilized Power Supply for Ionization Gages
for Industrial Use, by R. Henry. "Vide." Jan:
Feb., 1956. 6 pp. This simple, inexpensive, and
reliable stabilized power supply is intended for
industrial uses. Circuit diagrams are given and
the theory, operation and performance are discussed.
Source 6/6 -16G
Measurement and Analysis of Noise- Application
to Electrical Machinery, by M. Baron.
"But. Fr. El." Feb. 1956. 21 pp. In this extensive
survey, the physical as well as the physiological
methods of noise measurements are introduced
and related. This leads to requirements
for noise limit in machinery, analysis of
existing noise and methods for noise reduction.
Power station noise -reducing installations are
described as well as measures applicable to
electric motors. Source 6/6 -167
Electronic Amplifiers in Industrial Plants, by
R. Dehmlow. "AEG Prog." No. 4, 1956. 6 pp.
Article illustrates a number of amplifier circuits
used for speed and current control.The special
performance properties required from relay
and photoelectric amplifiers are discussed in relation
to their application to relay control circuits.
Source 6/6 -168
Applications of Magnetic Amplifiers, by A.
Lang. "AEG Frog." No. 4, 1956. 6 pp. Applications
of magnetic amplifiers as regulating
and control system components are described.
Source 6/6 -169
Prescribed -Function Vibration Generator, by P.
Honnell. "J. BIRE." Apr. 1956. 12 pp. An electromechanical
system which produces vertical
vibrations in the image of prescribed functional
waveforms is described and the mathematical
theory of its operation derived. The advantage
of this device is indicated by examples of the
response of vibration pick -ups to complex motions
of prescribed waveform. Source 6/6 -157
MATERIALS
Materials in Advanced Electronic Design, by
A. Middleton. "El. Mfg." May 1956. 7 pp. The
relationships between certain materials, components,
and circuit techniques are analyzed in
terms of organic growth. Tables define the
"old" and compare the "old" and the "new"
electronic components. Source 6/6 -244
Copper Clad Fluorocarbon Printed Wiring
Boards, by L. Allen and S. Stein. "El. Mfg."
May 1956. 4 pp. Bonded copper and polychlorotrifluorethylene
are provided for printed circuit
use by a special surface treatment. Same bonding
technique can be used for hermetic seals.
No reinforcing material or adhesive is needed.
Source 6/6 -245
Protecting and Packaging Electronic Equipment,
Part I, by W. Hannahs. "Tele- Tech"
June 1956. 4 pp. Recent experiences of the
military in hot, humid climates has focussed
attention on the need for protecting electronic
circuits against fungi and moisture, as well as
mechanical shock and stress. Protective measures
used to accomplish this goal are described
here. Source 6/6 -246
Potting Compounds -How and Why
Epoxy
They're Used, by Jack & Heintz and Freed
Transformer. "Insul." May 1956. 5 pp. This
article, after establishing a few fundamentals
concerning epoxy compounds, gives a number
of specific applications of these 2 companies.
Examples include vibration -proof relays, chokes,
and filters. Source 6/6 -170
Glossary of Insulation Words and Phrases, by
G. Moses. "Insul." May 1956. 4 pp. This fourth
article in the series "Insulation Engineering
Fundamentals" defines almost 100 words and
phrases of the language of the insulation engineer.
Source 6/6 -171
New Developments in Silicone Insulation, by
L. Teichthesen. "maul." May 1956. 2 pp. Applications
of silicone insulation in "Class H"
insulated motors. Silicone varnishes, glass laminates,
and Sylkyd enameled magnet wire are
covered. Source 6/6 -172
Electrons Produce High- Temperature Dielectric,
by J. Meikle and B. Graham. "El." May
1956. 4 pp. Wire insulation and structural
dielectric are produced by a production line
accelerator which bombards a special polyethylene
formulation with 1 -mev electrons. Source
6/6 -173
Winding Calculations for Ferroxcube Cores, by
J. Arrazau. "Onde." Mar. 1956. 16 pp. The
Ferroxcube pot-type cores present at nonuniform
magnetic cross-section ; the effective
Tele -Tech & ELECTRONIC INDUSTRIES June 1956 133