Example of Tactile Design:

Open- and Solid-Circle Number Line

The following points indicate the braille code, format rules, and design techniques that were used for this tactile graphic example.

• Nemeth braille code
• extension of axis line segments to allow space for multi-digit values (2.9)
• use of Special Symbols page to explain braille dot symbols (5.13, 6.5.1.13)
• non-use of numeric indicators for labels below the number line (6.5.1.1)
• use of blank lines before and after number line and labels (Nemeth rules for spatial arrangement) (6.5.1.2)
• inclusion of arrowheads as in print (6.5.1.3)
• no alteration of open and solid circles because they are mathematically significant (6.5.1.6)
• alignment of first digit of numeric label with regular scale mark (6.5.1.8)
• placement of ordinary labels (6.5.1.8)
• arrangement of number line on same line as itemized answer choices A-D. (6.5.1.9)
• use of embossed braille symbols allowed for grades 4 and up (6.5.1.13)
• placement of regular scale marks embedded within number line (6.5.1.13)
• placement of open and solid circles above number line (6.5.1.13)

Open- and Solid-Circle Number Line

Open- and Solid-Circle Number Line