HeathW. R.“Maps and Graphics for the Blind: Some Aspects of the Discriminability of Textural Surfaces for Use in Areal Differentiation,” Ph.D. thesis, University of Washington1958.
2.
ShermanJohn F.“Current Map Resources and Existing Map Needs for the Blind,”Surveying and Mapping, Vol. 24, No. 4, December, 1964.
3.
MorrisJ. E., and NolanC. Y.“Minimum Sizes for Areal Type Tactual Symbols,”The International Journal for the Education of the Blind, Vol. 13, No. 2, December, 1963.
4.
The clay coated paper has a very smooth hard surface and absorbs little ink, thus leaving more ink available as an adhesive for the resin. The resin used is a ground plastic with a low melting point and is available from the Virkotype Company in Plainfield, New Jersey. The letterpress is capable of depositing a greater amount of a slower drying ink than the offset press.
5.
At the same time, a booklet prepared by Recordings for the Blind was handed out to the participants. This booklet described the hotel and provided directions to the meeting rooms. This had been prepared for previous meetings and many blind persons relied upon this and never referred to the floor plan since it was neither explained nor advertised as being in existence.
6.
In a blind person's vocabulary, the action of seeing really denotes “looking” with their finger tips.
7.
There are three grades of braille. Grade 1 uses a direct translation, one braille cell for each letter. Grade 2 uses 185 contractions and is taught to all braille students. Grade 3 uses more contractions but is read by very few persons.
