Illustration: Producing a readable message with radio waves After Hertz sent radio waves across a room, nobody very much about it until, in 1894, Oliver Lodge (later Sir Oliver Lodge) transmitted radio waves  a distance of 150 yards.  Hertz...

Illustration: Wave motion, and how a wave is measured If study waves on water, it will help us to understand radio waves, always remembering that radio waves travel at 186,000 miles a second in ether (something which is supposed to be in...

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...