Издательство: | Книга по требованию |
Дата выхода: | июль 2011 |
ISBN: | 978-6-1326-8506-3 |
Объём: | 100 страниц |
Масса: | 172 г |
Размеры(В x Ш x Т), см: | 23 x 16 x 1 |
High Quality Content by WIKIPEDIA articles! The break key on computer keyboards origins go back to telegraph practices. A standard telegraph key has a built-in knife switch that can be used to short the key's contacts. When the key was not in use, that switch was kept closed, so that a signal was continually sent. If that steady-state signal was interrupted, it indicated one of two things: either the operator was about to start transmitting, or something else had happened to break the connection — such as a physical break in the telegraph line.
Данное издание не является оригинальным. Книга печатается по технологии принт-он-деманд после получения заказа.