Here is the "Electrician's Mate 3 - Navy Training Courses" (NAVPERS 10548)
in its entirety (or will be eventually). It should provide one of the Internet's best
resources for people seeking a basic electricity course - complete with examples worked
U.S. GOVERNMENT PRINTING OFFICE; 1949
Electrician's Mate 3 - Navy Training Courses NAVPERS
Introduction by Kirt Blattenberger
In January of 1945, my father-in-law, Marlet Goodwin, enlisted in the Merchant Marines
and spent two years working in the "belly of the beast" in the engine rooms of the ships
on which he sailed. He recently passed on to me some of the training manuals that he
received while in the Merchant Marines and later while in the Naval Reserves. Some of
the information contained in those manuals are amazingly detailed - both for mechanical
and electrical systems. Since the basics have not changed much over the past 70 years,
I thought it might be useful to make some of the content available here.
publications are considered to be in the public domain, and may be freely redistributed
so long as credit is given*. Accordingly, I have undertaken the
task of scanning and publishing the content of the Electrician's Mate 3 course here.
Other manuals will be added as time permits. The time consumed in doing so is extensive.
Each page was scanned once to do an optical character recognition (OCR) processing on
it, and then again to obtain the images (OCR tries to interpret images as text and makes
a real mess there). Although anyone may freely copy a government publication, no one
may copy my version of the publication of it. If you want to publish content from the
manuals, you must scan your own images and create your own duplicate text. However, I
welcome anyone to print out these complete pages for use in self-study, or even as part
of a classroom course - just be sure to give proper credit.
Here is the "Electrician's Mate 3 - Navy Training Courses" (NAVPERS 10548) in its
entirety (or will be eventually). It should provide one of the Internet's best resources
for people seeking a basic electricity course - complete with examples worked out (links
to quizzes at end of chapters).
Electrician's Mate 3 - Navy Training Courses
This book is written to aid the striker for Electrician's Mate 3 to qualify for advancement
to that rate. The combination of this training course and practical experience will enable
the striker to meet the official requirements for advancement to EM3. These requirements,
as given in The Manual of Qualifications for Advancement in Rating (NavPers 18068), are
reproduced in appendix II. This course is based on an elementary knowledge of electricity
and mathematics. Therefore, before starting this course the striker should complete the
two basic Navy Training Courses, Electricity, NavPers 10622, and Mathematics, NavPers
10620. The duties of an Electrician's Mate also require an elementary knowledge of machines,
tools, and blueprints. Hence, while studying this course, the striker should review these
additional basic Navy Training Courses-Basic Machines, NavPers 10624; Use of Tools, NavPers
10623; and Use of Blueprints, NavPers 10621. . This training course presents the basic
phenomena of direct current necessary for an EM3 to perform his duties on direct current
machinery. He should also have a similar back-ground on alternating current machinery.
Such background he will find in the appropriate chapters of the Navy training course
for Electrician's l.1ate 2c, NavPers 10103. As one of the NAVY TRAINING COURSES, this
book represents the joint efforts of the Training Publications Section of the Bureau
of Naval Personnel and of those Naval establishments specially cognizant of the technical
aspects of Electrician's Mates' duties.
TABLE OF CONTENTS
CHAPTER 1 Electrical currents and
circuits - Ohm's Law
CHAPTER 2 Magnetism
CHAPTER 3 Electromagnetism and
CHAPTER 4 lnduction
CHAPTER 5 Alternating and direct current generators
CHAPTER 6 Direct current generators
CHAPTER 7 Types of direct current generators
CHAPTER 8 Operation of direct current generators
CHAPTER 9 Direct current motors
CHAPTER 10 Maintenance of direct current motors and generators
CHAPTER 11 Page Direct current controllers
CHAPTER 12 Cables
CHAPTER 13 Batteries
CHAPTER 14 Electrical systems in small craft
CHAPTER 15 Searchlights
CHAPTER 16 Blueprint reading and sketching
CHAPTER 17 Safety precautions
APPENDIX I Answers to quizzes
APPENDIX II Qualifications for advancement
If you are in the Regular Navy, you will be striking for the general service rating
(EM). To meet the qualifications for 3rd class in this rating (see column EM, appendix
II) you will have to study all the chapters in this book. If you are a member of the
Naval Reserve you will be striking for either the emergency rating as power electrician
(EMP) or shop electrician (EMS). To meet the qualifications for EMS you have to study
all the chapters of this book except chapter 11 (D. C. Controllers). For EMP3 rate you
have to study all the chapters except chapter 10 (Maintenance of Direct Current Motors
and Generators). However, to gain a well-rounded view of the duties of the general service
rating, it is recommended that you also read the additional chapters 10 or 11, which
do not pertain directly to your rating.
* Relevant excerpt from the
Frequently Asked Questions About Copyright Issues Affecting the U.S. Government CENDI/2004-8
Updated March 2007
2.2.4 What is public domain? Public domain refers to works that are not protected
by copyright and are publicly available. They may be used by anyone, anywhere, anytime
without permission, license or royalty payment.
A work may enter the public domain because the term of copyright protection has expired
(see FAQ Section 2.1.6), because copyright has been abandoned, or in the U.S. because
it is a U.S. Government work and there is no other statutory basis for the Government
to restrict its access (see FAQ Section 3.1.5).
A work is not in the public domain simply because it does not have a copyright notice.
Additionally, the fact that a privately created work is, with permission, included in
a U.S. Government work does not place the private work into the public domain. The user
is responsible for determining whether a work is in the public domain.
It is important to read the permissions and copyright notices on U.S. Government publications
and Web sites. Many Government agencies follow the practice of providing notice for material
that is copyrighted and not for those that are in the public domain. Examples of government
agency copyright policies and statements are: National Library of Medicine,38 NASA Center
for AeroSpace Information (CASI),39 and Library of Congress.