Chronological listings, from 1900 through 1981, of significant discoveries and developments in medicine, communications, transport, energy, food technology, and other fields.The size of a suitcase, the radio has a bulky speaker placed under the car floorboards which gives sound of doubtful quality. ... The 50-line system used by the Bell Telephone Laboratories transmits the three primary colours a red, blue and green a along three separate ... Now telephone wires can carry some of the radio signals, with minimum power consumption and without changing the receiver.
|Title||:||Timetable of technology|
|Author||:||G. W. A. Drummer|