Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Tools and Equipment (hierarchy name)
5. equipment
6. [equipment by process]
7. image-making equipment
8. [equipment for drafting, drawing, and writing]
9. [drafting, drawing and writing equipment by general type]
10. drafting equipment
11. drafting instruments
12. drafting triangles

Anotations

Scope note:

Draftperson's triangles that include an adjustable arm to eliminate a need of multiple triangles with fixed angles. A protractor placed between the adjustable arm and the place where it is hinged assesses the angle of the clamped triangle.