Binary code practical applications such as computers, electric circuits, and more. The bit string is not the only type of binary code. A binary system, in general, is any system that allows only two choices such as a switch in an electronic system or a simple true or false test. Braille is a type of binary code that is widely used by the blind to read and write by touch, named for its creator, Louis Braille. This system consists of grids of six dots each, three per column, in which each dot has two states: raised or not raised. The different combinations
Museum of the American Printing House for the Blind are meant to be touched. A reader rail follows the entire museum with braille labels, audio devices, and tactile illustrations in front of each exhibit. Visitors will see original Talking Book recording and playback equipment, long canes and dog guide harness, original stereotype printing plates and equipment, a comprehensive collection of historic braillewriters, and many historic books printed in various tactile writing systems. These include "An Essay on the Education of the Blind" printed 1786 in the first raised letters for blind people; "The Gospel According to St. Mark" printed 1834 in raised Roman letters; John Bunyan's "Pilgrim's Progress" printed