Take Brief Notes
W.3.8
Read the text, then answer the questions.
How Braille Was Invented
Louis Braille was blinded in an accident at the age of three. At his school, blind pupils read by tracing raised letters pressed into paper. It worked, slowly — a fingertip cannot take in a whole letter shape at once — and nobody could write that way at all. When Braille was twelve, a soldier visited the school with a code of raised dots that soldiers used to read messages in the dark. It was too complicated, but the idea of dots was right. Braille spent three years simplifying it. He settled on a cell of six dots, small enough to sit under one fingertip. He was fifteen when he finished. He was forty-three when he died, and the system was not widely accepted until after that.
- 1. How old was he when he finished the system?
- 2. How old was Louis Braille when he lost his sight?
- 3. How many dots are in a braille cell?
- 4. The author says raised letters worked slowly. What reason is given?
Morse Code
Morse code turns every letter into a pattern of short and long signals: dots and dashes. The commonest letters were given the shortest patterns. E is one dot. T is one dash. Q, which is rare, is dash-dash-dot-dash. Because of that choice, an average message is much shorter than it would be otherwise. A message can be sent as sound, as light, or as taps on a pipe. That is why it survived so long: it needs almost no equipment. Timing carries the meaning. A dash is three times as long as a dot. The gap between letters is three dots long, and between words, seven. SOS was chosen because it is easy to recognise: three dots, three dashes, three dots.
- 1. The author says Morse survived a long time. What reason is given?
- 2. How long is a dash compared with a dot?
- 3. How is this text organised?
- 4. What is the Morse pattern for E?
LessonPrint · W.3.8 · Set 10 · free to copy for classroom use