CENTER LINESLines that indicate the center of a
circle, arc, or any symmetrical object; consist of
alternate long and short dashes evenly spaced.
CIRCLE A plane closed figure having every point on
its circumference (perimeter) equidistant from its
CIRCUMFERENCEThe length of a line that forms
CLEVISAn open-throated fitting for the end of a rod
or shaft, having the ends drilled for a bolt or a pin.
It provides a hinging effect for flexibility in one
COMPUTER-AIDED DRAFTING (CAD)A
method by which engineering drawings may be
developed on a computer.
(CAM)A method by which a computer uses a
design to guide a machine that produces parts.
COMPUTER LOGICThe electrical processes used
by a computer to perform calculations and other
CONEA solid figure that tapers uniformly from a
circular base to a point.
CONSTRUCTION LINESLightly drawn lines used
in the preliminary layout of a drawing.
CORNICEThe projecting or overhanging structural
section of a roof.
CRESTThe surface of the thread corresponding to
the major diameter of an external thread and the
minor diameter of an internal thread
CUBERectangular solid figure in which all six faces
CUTTING PLANE LINEA line showing where a
theoretical cut has been made to produce a section
CYLINDER A solid figure with two equal circular
DEPTHThe distance from the root of a thread to the
crest, measured perpendicularly to the axis.
DESIGNER'S WATERLINEThe intended position
of the water surface against the hull.
DEVELOPMENT The process of making a pattern
from the dimensions of a drawing. Used to fabricate
sheet metal objects.
DIGITALThe processing of data by numerical or
DIMENSION LINEA thin unbroken line (except in
the case of structural drafting) with each end
terminating with an arrowhead; used to define the
dimensions of an object. Dimensions are placed
above the line, except in structural drawing where
the line is broken and the dimension placed in the
DRAWING NUMBERAn identifying number
assigned to a drawing or a series of drawings.
DRAWINGS The original graphic design from which
a blueprint may be made; also called plans.
ELECTROMECHANICAL DRAWINGA special
type of drawing combining electrical symbols and
mechanical drawing to show the position of
equipment that combines electrical and mechanical
ELEMENTARY WIRING DIAGRAM(1)
shipboard wiring diagram showing how each
individual conductor is connected within the
various connection boxes of an electrical circuit
system. (2) A schematic diagram; the term
elementary wiring diagram is sometimes used
interchangeably with schematic diagram, especially
a simplified schematic diagram.
ELEVATIONA four-view drawing of a structure
showing front, sides, and rear.
ENGINEERS SCALEThe scale used whenever
dimensions are in feet and decimal parts of a foot,
or when the scale ratio is a multiple of 10.
EXPLODED VIEWA pictorial view of a device in a
state of disassembly, showing the appearance and
interrelationship of parts.
EXTERNAL THREADA thread on the outside of a
member. Example: a thread of a bolt.
FALSEWORKTemporary supports of timber or
steel sometimes required in the erection of difficult
or important structures.
FILLETA concave internal corner in a metal
component, usually a casting.
FINISH MARKSMarks used to indicate the degree
of smoothness of finish to be achieved on surfaces
to be machined