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nal ELECTRONIC SOUR
ES
the emission determined from equilibrium conditions.
Source 6/6 -2
Application of Boolean Algebra to a Synchronous
Magnetic Digital Computer (PB
119445), by A. Karson, Aberdeen Proving
Ground. Aug. 1955. 15 pp. Mic $2.40, pho $3.30.
(LC) The schematic diagram of a synchronous
digital magnetic computer is presented; the
reader is then introduced to the problems involved
in its design and analysis, and shown
how Boolean algebra may be used as a tool
which aids in understanding and analyzing
this type of system. Source 6/6 -3
Digital Compensation of Continuous -Data
Feedback Control Systems (PB 119151), by K.
Maitra and P. Sarachik, Columbia U. Aug.
1955. 44 pp. Mic $3.30, pho $7.80. (LC) Two
classes of systems are discussed, namely, duplicators
and regulators. In the duplicator problem.
the system is required to follow the reference
input with no steady state error with
the fastest possible rise time and minimum
overshoot. In the regulator system, the output
to any suddenly applied disturbance should
decay rapidly with, if possible, no overshoot.
The methods of digital compensation described
can be used to optimize the performance of
continuous systems. Source 6/6 -4
Fast Carry Logic For Digital Computers (PB
111751), by B. Gilchrist, J. Pomerene, and S.
Wong, Princeton U. July 1955. 13 pp. 500.
(OTS) Existing large scale binary computers
typically must allow for maximum full length
carry time in each addition. Average carry
sequences are significantly shorter than this
maximum, on the average only 5 stages for a
40 digit addition. A method is described to
realize the implied 8 to 1 time saving by deriving
an actual "carry completion" signal.
Source 6/6 -5
ORDVAC Stored Subroutines to Replace IBM
Control Panels (PB 119278), by R. Boyell,
Aberdeen Proving Ground. June 1955. 26 pp.
Mic $2.70, pho $4.80. (LC) Description of a
series of subroutines that will enable the
ORDVAC to conveniently work with decimally
punched IBM cards, and have the same degree
of flexibility as wired control panels on conventional
IBM equipment. Source 6/6 -6
Survey of Domestic Electronic Digital Computing
Systems (PB 111996), by M. Weik, Aberdeen
Proving Ground. Dec. 1955. 271 pp. $4.75.
(OTS) The engineering characteristics, logical
features, cost factors, and personnel requirements
of 84 different domestic digital computing
systems are described. An analysis of the
computer field, a discussion of trends, and a
complete glossary of computer engineering and
programming terminology are included. Source
6/6 -7
Synthesis and Critical Study of Sampled -Data
Control Systems (PB 119447), by E. Jury,
Calif. U. Aug. 1955. 68 pp. Mic $3.90, pho
$10.80. (LC) The modified z- transform method
has been applied to the synthesis and critical
study of sampled -data control systems. It is
shown that this method of analysis will remove
all of the restrictions formerly imposed on the
z- transform. Tables and examples are derived
to demonstrate the application of this modified
z- transform method. Source 6/6 -9
Study of an Anticipator Type Control for an
Airframe (PB 119384), by M. Iwami, Calif. U.
Sep. 1955. 75 pp. Mic $4.50, pho $12.30. (LC)
An investigation was made of the optimization
of an underdamped non -linear third -order system
by means of an anticipatory relay servomechanism.
The results of the study were successfully
applied to the pitch acceleration
control mechanism of an airplane as simulated
by an analog computer. Source 6/6 -10
Vacuum Tube Electrometer with High Input
Impedance (PB 119253), by M. Andrews and
E. Weise, Illinois Eng'g Experiment Station.
July 1966. 14 pp. Mic $2.40, pho $3.80 (LC)
For the measurement of small do voltages
across very high resistances, a vacuum tube
electrometer has been built. Feedback is used
to make the input resistance match the resistance
across which the voltage is to be
measured, and to increase the range, linearity,
and stability. Source 6/6 -11
Electrical Admittance of a Circular Ferroelectric
Disc (PB 119233), by H. Baerwald,
Brush Labs. Jan. 1965. 44 pp. Mic $3.30, pho
$7.80. (LC) Formulae and graphs are presented
which permit quick and accurate evaluation
of the planer piezoelectric coupling factor
and of an associated elastic modulus of polarized
ferroelectric ceramics on the basis of the
measurement of the fundamental resonance
and antiresonance frequency of circular discs
of small ratio thickness to diameter. Source
6/6 -12
Measurements of the Attenuation of a Repeated
Shock Wave (PB 119067), by I. Rudnick,
Soundrive Engine Co. Feb. 1958. 19 pp. Mic
$2.40, pho 33.30. (LC) A siren and microphone
system, capable of producing and measuring
sound waves of large amplitude, is used to
determine the rate of attenuation of large
amplitude waves in the frequency range 80 to
200 cps. The results are discussed in terms of
known theories of attenuation. Source 6/6 -18
On the Statistics of Switch Closing Time (PB
119276), by G. Weiss, Aberdeen Proving
Ground. July 1955. 15 pp. Mic $2.40, pho $3.80.
(LC) This paper derives formal relations for
the probability distribution between activation
and closure of a switching network, in terms
of the probability distributions for the constituent
switches. A particular application is
made to a network with a Gaussian time lag.
Source 6/6 -14
Progress Report for Period Oct Thru Dec 1954
Under Contract Nonr- 248(42) (PB 119176), by
F. Eldridge, Johns Hopkins U. Dec. 1954. 16
pp. Mic $2.40, pho $3.30. (LC) The primary
object of the project is to develop a means of
transforming a pulse code into voice signals
for such purposes as' 1 Receiving information
on combat communication networks. 2. Receiving
automatic weather broadcasts. 3. Monitoring
digital computors and automatic communications
networks, such as those used for guided
missiles and autopilots. 4. Providing security
and antijamming features for voice circuits.
Source 6/6 -16
Problems in Theory and Technique of Antennas,
Part I (PB 119640), Germany. (Text
in English and German) Mar. 1943. 598 pp.
Mic $11.10, pho $90.66. (LC) Collection of 19
reporta prepared by the Generalbevollmach -
tigten fur Technische Nachrichtenmittel for
presentation at the Vierjahresplan Institut fur
Schwingungsforschung, Mar 24-26, 1943.
Source 6/6 -16
Circularly Polarized Slot Radiators (PB
111904), by A. Simmons, NRL. Jan. 1956. 17
pp. 500. (OTS) Results of a study of the
properties of a pair of narrow slots crossed at
right angles and located at the proper point
in the broad wall of a rectangular waveguide.
A circularly polarized wave is radiated. Source
6/6 -17
Continuous Monitor of Radar Performance
(PB 111956), by T. Dlugolecki, USAF. Sep.
1956. 26 pp. 76e. (OTS) Description of an
experimental model of a continuous monitor
of radar performance. Unit monitors transmitter
power output, receiver noise figure.
and relative tuning of the local oscillator without
the necessity of taking the equipment
out of operation. Source 6/6 -18
Density Modulation of an Electron Stream
from a Field Emitter Cathode (PB 119593),
by D. Goodman, Calif. U. Aug. 1955. 86 pp.
Mie $4.80. pho $13.80. (LC) investigation
deals principally with the proposal that a
density modulated electron stream may be
achieved by the control of the number of
electrons leaving the metallic cathode as field
emitted electrons rather than by the formation
of electron bunches from a thermionic cathode
by the resultant action of a force field upon
the electrons. Source 6/6-19
Flip -Flop Circuit Based on Frequency Memory
(PB 119686), by H. Lee, Stanford U. Jan.
1955. 47 pp. Mic $3.30, pho $7.80. (LC) Analysis
is based on a bistable oscillator with 2
degrees of freedom, forced with an external
signal. A 10- frequency decimal counter based
on beat -frequency techniques is discussed. A
new technique for frequency switching based
on a single variable is introduced and studied
in terms of the behavior of the roots in the
complex frequency plane. Source 6/6-20
Low -Noise L -Band Amplifier (PB 111907), by
L. Hoffman and H. Montague, NRL. Feb.
1966. 8 pp. 500. (OTS) A simple and compact
coaxial cavity amplifier for the 1250 to 1350
MC range has been designed using a GL -6299
(Z -3011) triode. Input is taken from a tunable
TR cavity by means of an adjustable
loop, and the output is fed to a Pound -type
mixer. Source 6/6-21
Measurement of the Microwave Properties of
Ferrites at High Power Levels (PB 111826)
by J. Carter and I. Reingold, Signal Corps
Eng'g Labs. Feb. 1956. 21 pp. 750. (OTS)
Results indicate that ferrite samples with
satisfactory values of rotation and loss can
be obtained for operation over a narrow frequency
band. Two avenues of approach should
be pursued in the evaluation: 1) the evaluation
of the ferrite completely divorced from the
microwave plumbing, and 2) investigation of
the ferrite in the microwave configuration.
Source 6/6 -22
Note on Stray Loading of Phase Bridges
(PB 119524), by J. Williams, Harvard U.
Jan. 1955. 15 pp. Mic $2.40, pho $3.30. (LC)
The quadrature voltages derived by means of
phase bridges are subject to error in relative
magnitude or phase angle because of loading
of the bridge output points by stray impedances.
Two resistance -capacitance bridges with
either resistance -capacitance or purely capacitance
loading are considered and it is shown
that output voltages can be made errorless.
Source 6/6 -23
Piezoelectric Crystal Studies and Measurements,
Tenth (Final) Quarterly Report for the Period
1 May 1952 -31 Jan 1953 (PB 119602), by K.
Van Dyke, Wesleyan U. Apr. 1963. 49 pp.
Mic $3.30, pho $7.80. (LC) Investigations into
the effects of varying the area and geometry
of plated crystals on the parameters of quartz
crystal plates; into the Q's of small quartz
rings with a view to comparing the viscous
properties of natural and synthetic quartz; and
into the matrices of the properties of piezoelectric
crystals. Source 6/6 -24
PATENTS
Complete copies of the selected patents described
below may be obtained for $.25 each
from the Commissioner of Patents, Washington
26, D. C.
Pulse Width Discriminator Circuit, #2,737,585.
Inv. E. Hughes. Assigned International Telemeter
Corp. Iss. Mar. 6, 1966. In a circuit
having 2 triodes with a common cathode connection,
a bias is applied to maintain 1 tube
conducting and the other cut -off. When a cutoff
signal is applied to the first tube, the second
tube conducts when the cut-off signal is
applied in excess of a predetermined interval.
6/6 -60
Semiconductor Variable Circuit, #2,737.601.
Inv. M. McMahon. Assigned Hughes Aircraft
Co. Iss. Mar. 6, 1956. The variable delay circuit
uses a junction -type semiconductor crystal
140 Tele -Tech & ELECTRONIC INDUSTRIES June 1956