BS 3521-2:1991+A1:1996

Foreword
Committees responsible
Glossary
Section
1 General terms and styles
2 Nomenclature of parts
3 Shapes for lenses and apertures in frames
4 Processes
5 Types of welded and soldered attachments
6 Dimensions and measurements
Figures
1 Boxed lens systems (single lens)
2 Diagrammatic representation of boxed lens systems
    for spectacles
3 Crest height
4 Projection (or inset) of bridge
5 Projection of bridge when rims do not lie
    substantially in a plane
6 Angle of crest
7 Distance between rims (DBR) of a regular bridge
8 Apical radius of a regular bridge
9 Vertical angle of pad
10 Pad angles
11 Ear point and angle of the side
12 Length to tangent
13 Dimensions of drop-end sides
14 Frame temple width, frame head width and angle of
    let-back
15 Swept-back lug
16 Inward angle of drop
Index

Terms used to describe the shapes, parts of and processes in the production of frames.