The Basics: Three Important Definitions

  1. The Circumference is distance around the outside of the circle.
  1. The Diameter is a line drawn completely through a circle including the center point.

  2. The Radius is a line extending from the center point of the circle to the circumference. The radius is always the same from any point on the circle to center.
Bent Glass Deals with Parts of Circles

All circles are divided into 360 degrees of an arc. For example, 1/8 of a circle = 45 degrees of arc and 1/4 of a circle = 90 degrees of arc.



Measuring Circular Curves

  1. The Girth is the length around a curve.
    - measurement taken on either the concave or convex face of the glass (specify which).
    - measurement must be taken with flexible tape.
  1. The Height (or width) is the length of the glass

  2. The Radius is 1/2 the diameter.
    - measurement taken on either the concave or convex face of the glass (specify which).
    - if an exact measurement can't be taken, give the chord and depth measurements.

  3. The Chord is the line segment between two points on a given curve.
    - measurement must be taken with a flat ruler.

  4. The Depth is the distance between the chord and the highest point of the curve.
  5. Angle is the angle measurement in degrees of the bend.




Measuring Bent Glass with One or Two Flats

Some bent glass configurations have attached flats. A flat is a flat area at right angle to the radius. Additional measurement information is needed.

  1. The Girth is length around curve including any flat areas.
  1. The Length of the Flat or Flats.
    - measure the length or the flat portion of the glass.

  2. The Chord is the line segment between two points on a given curve.

  3. The Depth is the distance between the chord and the highest point of the curve.

Measuring Reverse Curves

Some bent glass configurations have attached flats. A flat is a flat area at right angle to the radius. Additional measurement information is needed.
 
 
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