Part 8

Mixed. One of straight and curved lines.

Center. A line used to indicate the center of an object.

Construction. A working line used to obtain required lines.

Dotted. A line composed of short dashes. - - - - - -

Dash. A line composed of long dashes. -- -- --

Dot and Dash. A line composed of dots and dashes alternating. -- · -- · --

Dimension. A line upon which a dimension is placed.

Full. An unbroken line, usually representing a visible edge. ------

Shadow. A line about twice as wide as the ordinary full line.

A straight line is often called simply a line, and a curved line a curve.

=LONGITUDINAL.=--In the direction of the length of an object.

=MODEL.=--A form used for study.

=OBLIQUE.=--Neither horizontal nor vertical.

=OBLONG.=--A rectangle with unequal sides.

=OVAL.=--A plane figure resembling the longitudinal section of an egg; or elliptical in shape.

=OVERALL.=--The entire length.

=PARALLEL.=--Having the same direction and everywhere equally distant.

=PATTERN.=--That which is used as a guide or copy in making things.

Flat. One made of paper or other thin material.

Solid. One which reproduces the form and size of the object to be made.

=PERIMETER.=--The boundary of a closed plane figure.

=PERPENDICULAR.=--At an angle of 90°.

=PERSPECTIVE.=--View; drawing objects as they appear to the eye from any given distance and situation, real or imaginary.

=PLAN.=--Plan, horizontal projection and top view have the same meaning.

=PLANE FIGURE.=--A part of a plane surface bounded by straight or curved lines, or by both combined.

=POLYGON.=--A plane figure bounded by straight lines called the sides of the polygon. The least number of sides that can bound a polygon is three. Polygons bounded by a greater number of sides than four are denominated only by the number of sides.

A polygon of five sides is called a Pentagon; of six, a Hexagon; of seven, a Heptagon; of eight, an Octagon; of nine, a Nonagon, etc.

Diagonals of a polygon are lines joining the vertices of angles not adjacent.