Publisher's Synopsis
Each title in this series takes one simple scientific principle as a basis for explaining the workings of a selection of everyday gadgets and machines. The illustrations aim to de-mystify the scientific theory and expose the workings of each machine.;Focusing on levers, this book describes such terms as fulcrum, effort and load, and sets out to show how levers are used in a multitude of everyday machines, from a simple spade to a grand piano and a seesaw to a typewriter.
