All Imperial drawing sizes are multiples of the standard 8-1/2” x 11” sheet of paper. This ensures that when a drawing is folded down it will always fold down into the standard sheet size, and fit easily into a 9” x 12” envelope.

Drawing numbers generally start with the sheet size. 
For example:

                        Dwg. No. B-206-1257 would be on an 
11” x 17” sheet.

            Using the sheet size as part of the Drawing Number can help to locate a drawing in a busy office because it indicates how big the drawing is. A-size and B-size drawings are usually kept in filing cabinets. C-size drawings and larger are usually kept in large drawing drawers or drawing hangers.

            Metric sizes are also contained in Drawing Numbers: 

                        A1-95-100-1

Drawing Media
The Instructor will show you samples of the following: 

• Tracing Paper

• Vellum

• Plotting Bond

• Regular Bond

• Blue Print Bond

• Mylar - 2 sided

Making a reproduction 
(blueprint or large photocopy).

              Instructor will demonstrate.

Folding of Drawings  

            Instructor will demonstrate.