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 specific type]
10. compasses (drawing instruments)

Anotations

Scope note:

Drafting tools used to maintain scale ratio when transferring proportions of plans or objects to another surface. These have two arms connected with an adjustable pivot point that determines if the scaling factor is larger, smaller, or the same size when transferring.