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photostat form, $18.75. Orders for PB
107274 should be addressed to the Library
of Congress, Photoduplication
Service, Publication Board Project,
Washington 25, D. C., with check or
money order payable to the Librarian
of Congress.
DIESEL ELECTRIC SETS
Actual operating experiences with
"Caterpillar" diesel electric sets
throughout the United States and Canada
are featured in an eight -page bulletin
published by Caterpillar, Peoria,
Ill. Entitled "Power Guards for Communications,"
it emphasizes the need
for uninterrupted service in the many
fields of communications -and the important
part that a dependable power
source plays in making this service
possible. Specifications for ten different
diesel electric sets are included.
POWER CONVERSION UNITS
A two -color booklet describing the
complete G -E line of metallic rectifier
power conversion units is available
from the General Electric Company,
Schenectady 5, N. Y.
This illustrated eight -page bulletin,
GEA- 5658A, contains design features,
performance characteristics, circuits,
applications and advantages of the G -E
Z
le
OPHAR
WAXES
line. A chart of the dimensions, ratings
and weights is also included, together
with guide form specifications.
RCA TUBE TYPES
The Tube Department of Radio Corporation
of America recently issued a
revised edition of its list of preferred
tube types for new equipment design.
The revisions involve changes resulting
from technological advances in tube design
and application.
A copy of this latest issue of the
RCA list can be obtained on request
from Commercial Engineering, RCA
Tube Department, Harrison, N. J.
OTS PUBLICATIONS
COMPOUNDS
Zophar waxes, resins and compounds
to impregnate, dip, seal, embed, or pot,
electronic and electrical equipment or
components of all types; radio, television,
etc.
Cold flows from 100 °F. to 285 °F
Special waxes non -cracking at -76 °F.
Compounds meeting Government specifications,
plain or fungus resistant.
Let us help you with your engineering
problems.
ZOPHAR MILLS, INC.
112 -130 26th Street,
Brooklyn 32, N. Y.
PR 111051
How to build aircraft electronic
equipment so as to eliminate operational
disturbances (natural static and
interference from other equipment) is
explained in a report entitled "Design
Techniques for
Interference-Free
Operation of Air-
borne
Electronic
Equipment." 459
pages. $11.50. Orders
for PB 111051
should be addressed
to the Office
of Technical
Services, U. S. Department
of Com-
merce, Washington
25, D. C.,
accompanied by
check or money
order payable to
the Treasurer of
the United States.
PB 107274
"The Sleeve Antenna"
describes
an improved type
of short -wave antenna
-a coaxial
cable in which the
inside central rod
is made to extend
beyond the outside
cylinder forms an
effective "sleeve"
type antenna for
radiating shortwave
energy. 141
pages. On microfilm,
$5.75; in
INDUSTRIAL CONTROLS
Complete information on Barber -Colman
industrial controls is now available
in Catalog F- 3941 -2. Products covered
include thermostats, a proportioning
pressure switch, humidity controls,
motor -operated and solenoid valves,
temperature regulators, control motors,
relays, and electrical accessories.
Address your request for a copy of
F- 3941 -2 to the Barber- Colman Company,
Rockford, Ill.
INTEGRATOR
Instron Engineering Corporation, 2
Hancock Street, Quincy 71, Mass., announces
the availability of a bulletin
describing the Instron integrator -an
electromechanical device for obtaining
the time integral of a varying input
signal.
Included in this bulletin are the various
possible applications of the integrator,
a general description of the
device, its principle of operation, input
requirements, and specifications.
MICROWAVE INFORMATION
Economic aspects of multichannel
operation of telephone and telegraph
circuits over microwave radio links are
emphasized in the new Lenkurt Bulletin
72A -P16. Entitled "Microwave in the
Telephone Toll Plant," it may be obtained
from the Lenkurt Electric Company,
County Road, San Carlos, Calif.
Among the subjects discussed in this
publication are: the investment required
for microwave equipment; the
revenue possibilities which microwave
provides; and the way in which the use
of microwave affects such problems as
future system growth.
COOK BROCHURE
Bulletin R -10 is a 47 -page brochure
containing information on the latest
facilities and services of the new Cook
Research Laboratories in Skokie, Ill., a
division of the Cook Electric Company.
It will be mailed to anyone interested
in research, development and instrumentation
in the fields of nuclear physics,
servomechanisms, upper air research,
weather reconnaissance, radar, sonar,
guided missiles and general electronics.
Write to Cook Electric Company, 2700
Southport Avenue, Chicago 14, Ill., for
your copy.
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R A D I O - E L E C T R O N I C E N G I N E E R I N G APRIL, 1953