Whilst the television camera is picking up the picture, we must have some means of picking up the voices of the actors or commentators and all the other sounds connected with the scene being televised. The camera's job is to turn the sound into...

Illustration: Edward Hughes listens to radio waves The story of radio began when, as long as 1964, a Cambridge University professor, James Clerk Maxwell, completed an amazing work of pure mathematics that dealt with something with which he had...

Illustration: A Boneshaker and a Penny-Farthing The bicycle first become known as a means of transport when the 'hobby horse' was shown at the exhibition at an exhibition in Paris in 1818- It was a wooden frame with two wooden wheels and no...

Before the radio was invented people used diverse ways of communication and signals. Here is a flag signal semaphore chart widely adopted and used in the maritime world in 19th and at the beginning of 20th Century.  Illustration: The story of...