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CHAPTER 3
SHIPS' DRAWINGS AND DIAGRAMS
LEARNING OBJECTIVES
Upon completion of this chapter, you should be able to do the following:
2. Describe the procedures in verifying the accuracy
1. Describe the different types of ships' drawings.
of ships' drawings and systems diagrams.
BLUEPRINTS
INTRODUCTION
Drawing or sketching is the universal language used
Blueprints are reproduced copies of mechanical or
by engineers, technicians, and skilled craftsmen.
other types of technical drawings. The term blueprint
reading means interpreting the ideas expressed by
Whether this drawing is made freehand or with drawing
others on drawings, whether the drawings are actually
instruments, it is needed to convey all the necessary
blueprints or not.
information to the individual who will fabricate and
assemble the object whether it be a building, a ship, an
aircraft, or a mechanical device. If many people are
HOW PRINTS ARE MADE
involved in the fabrication of the object, copies (prints)
are made of the original drawing or tracing so all persons
A mechanical drawing is drawn with instruments
involved will have the same information. Not only are
such as compasses, ruling pens, T-squares, triangles, and
drawings used as plans to fabricate and assemble
french curves. Prints (copies) are reproduced from
objects, they are also used to illustrate how machines,
original drawings in much the same manner as
ships, aircraft, and so on are operated, repaired, and
photographic prints are reproduced from negatives.
maintained.
The original drawings for prints are made by
The chapter contains general information about the
drawing directly on, or tracing, a drawing on a
various types of ships' drawing and system diagrams
translucent tracing paper or cloth, using black
that you should be familiar with as an IC1 or ICC. They
waterproof (india) ink or a drawing pencil. This original
include the following:
drawing is normally called a tracing "master copy."
These copies of the tracings are rarely, if ever, sent to a
Blueprints
shop or job site. Instead, reproductions of these tracings
Electrical prints
are made and distributed to persons or offices where
needed. These tracings can be used over and over
Electronic prints
indefinitely if properly handled and stored.
Electromechanical drawings
Blueprints are made from these tracings. The term
blueprints is a rather loosely used term in dealing with
Logic diagrams
reproductions of original drawings. One of the first
As an IC1 or ICC, you should have an indepth
processes devised to reproduce prints or duplicate
knowledge of how to use, care for, update, and verify
tracings produced white lines on a blue background,
the accuracy of these drawings. Drawings have a variety
hence the term blueprints. Today, however, other
of uses, and you, as a supervisor, will come to realize
methods of reproduction have been developed, and they
the importance of drawings.
produce prints of different colors. The colors may be
3-1

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