This book explores the benefits and uses of the pulley. This clever device uses rope wound over a grooved wheel to help lift heavy loads. RobbO and RobbEE use a pulley to remove the engine from their car.

Includes index.

The robots' workshop -- How pulleys work -- An impossible load -- Pulleys at sea -- Pulleys up high -- More pulleys up high -- On the ski lift -- Helicopter rescue -- Robbo's science -- Workshop -- Build a muscle builder.