List of episodes
Content: Geoffrey Bell’s Shell Film Unit short (produced by Arthur Elton) turns the history and physics of power transmission—from lever and pulley to the toothed gear—into a crisp lesson, blending live action with Francis Rodker’s animated diagrams to show how gearing underpins modern industry. Often cited as a model of clear scientific exposition.
United Kingdom
Documentary
20 minutes
1939
Geoffrey Bell
Shell Film Unit
Movie content ⇀