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From the film archive
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How Erie Canal Locks Carried Boats Across New York’s High Ground
0:25Film / EraHint
How a Waterwheel Powers the Millstones That Grind Grain
0:24Film / EraHint
How a Fresnel Lens Focuses a Lighthouse Beam
3:05Film / EraHint
How Clocks Turn Motion Into Time
0:40Film / EraHint
Why Are So Many Venetian Routes Made of Water?
0:33Film / EraHint
Why does winding a mechanical clock not move its hands immediately?
3:24Film / EraHint