ONBOARD PLANSSee SHIPS PLANS.
produced when projectors are perpendicular to the
plane of the object. It gives the effect of looking
straight at one side.
PARTIAL SECTIONA sectional view consisting of
less than a half section. Used to show the internal
structure of a small portion of an object. Also
known as a broken section.
through the outlines of the hull ends and the
PERSPECTIVE The visual impression that, as
parallel lines project to a greater distance, the lines
move closer together.
PHANTOM VIEWA view showing the alternate
position of a movable object, using a broken line
PHASEAn impulse of alternating current. The
number of phases depends on the generator
windings. Most large generators produce a
three-phase current that must be carried on at least
PICTORIAL DRAWINGA drawing that gives the
real appearance of the object, showing general
location, function, and appearance of parts and
PICTORIAL WIRING DIAGRAM A diagram
showing actual pictorial sketches of the various
parts of a piece of equipment and the electrical
connections between the parts.
PIER A vertical support for a building or structure,
usually designed to hold substantial loads.
PITCH The distance from a point on a screw thread
to a corresponding point on the next thread,
measured parallel to the axis.
PLAN VIEW A view of an object or area as it would
appear from directly above.
PLATA map or plan view of a lot showing principal
features, boundaries, and location of structures.
POLARITY The direction of magnetism or direction
of flow of current.
PROJECTION A technique for showing one or more
sides of an object to give the impression of a
drawing of a solid object.
PROJECTOR The theoretical extended line of sight
used to create a perspective or view of an object.
RAFTERA sloping or horizontal beam used to
support a roof.
RADIUSA straight line from the center of a circle or
sphere to its circumference or surface.
REFERENCE DESIGNATIONA combination of
letters and numbers to identify parts on electrical
and electronic drawings. The letters designate the
type of part, and the numbers designate the specific
part. Example: reference designator R-12 indicates
the 12th resistor in a circuit.
REFERENCE NUMBERSNumbers used on a
drawing to refer the reader to another drawing for
more detail or other information.
REFERENCE PLANEThe normal plane that all
information is referenced
REMOVED SECTIONA drawing of an objects
internal cross section located near the basic drawing
of the object.
REVISION BLOCKThis block is located in the
upper right corner of a print. It provides a space to
record any changes made to the original print.
REVOLVED SECTIONA drawing of an objects
internal cross section superimposed on the basic
drawing of the object.
ROOTThe surface of the thread corresponding to the
minor diameter of an external thread and the major
diameter of an internal thread
ROTATION A view in which the object is apparently
rotated or turned to reveal a different plane or
aspect, all shown within the view.
ROUNDThe rounded outside corner of a metal
SCALEThe relation between the measurement used
on a drawing and the measurement of the object it
represents. A measuring device, such as a ruler,
having special graduations.
SCHEMATIC DIAGRAMA diagram using graphic
symbols to show how a circuit functions electrically.
SECTION A view showing internal features as if the
viewed object has been cut or sectioned
SECTION LINESThin, diagonal lines used to
indicate the surface of an imaginary cut in an object.