The Basics: Three Important Definitions

1. The Circumference:
Distance around the outside of the circle.

 

2. The Radius:
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.

3. The Diameter:
A line drawn completely through a circle including the center point.




 

Bent Glass Design, Inc. 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.

 
1. The Girth
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.
 
2. The Height (or width):
The length of the glass.
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 Depth:
Distance between the chord and the highest point of the curve.

4. The Angle:
Angle measurement in degrees of the bend.

5. The Chord:
Line segment between two points on a given curve.
- measurement must be taken with a flat ruler.




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

Measuring Bent Glass with One or Two Flats

1. The Girth:
Length around curve including any flat areas.

2. The Length: (of the Flat or Flats.)
- measure the length or the flat portion of the glass.

 
3. The Chord:
Line segment between two points on a given curve.

4. The Depth:
Distance between the chord and the highest point of the curve.



 


Measuring Reverse Curves

For reverse curves, measure the Girth by letting your flexible tape follow along the curves. To obtain the Radius or the Chord and Depth, treat each of the curves as a separate unit. Follow steps outlined for cylindrical bend.

 

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Bent Glass Design, Inc., 3535 Davisville Road, Hatboro, PA 19040
Phone: 215.441.9101  Fax: 215.441.9190  email: bentglass@nni.com

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