Three years ago a gentleman in Syracuse ... balloons than steam carriages on common roads. An invention to be successful must not only be new, but useful—an improvement. Any plan or invention ...

Child: In 1914 the skies were different. They were quiet. Planes were a very new invention, they were rare and fragile. But when World War One started they became weapons. Pilots could spy on ...

One of their models is the Essence fan, which has a diameter of 2.4-4.3 metres. It has curved blades that increase contact with air. The company says that one 2.4m Essence fan can do the work of ...