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703.3.1 Dimensions and Capitalization
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Braille dots shall have a domed or rounded shape and shall comply with Table 703.3.1. The indication of an uppercase letter or letters shall only be used before the first word of sentences, proper nouns and names, individual letters of the alphabet, initials, and acronyms.
Measurement Range | Minimum in Inches Maximum in Inches |
---|---|
1. Measured center to center. | |
Dot base diameter | 0.059 (1.5 mm) to 0.063 (1.6 mm) |
Distance between two dots in the same cell 1 | 0.090 (2.3 mm) to 0.100 (2.5 mm) |
Distance between corresponding dots in adjacent cells 1 | 0.241 (6.1 mm) to 0.300 (7.6 mm) |
Dot height | 0.025 (0.6 mm) to 0.037 (0.9 mm) |
Distance between corresponding dots from one cell directly below 1 | 0.395 (10 mm) to 0.400 (10.2 mm) |
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