Let's Look at Water

Collaborateurs : Paquette, Vincent | Randall, Harold | National Film Board of Canada (Ottawa)

An account of how a city’s water supply is purified. Each stage of purification in a filtration plant is shown, together with the complex system of underground mains serving all parts of the city. The safeguarding of water supplies on common carriers (trains, ships, aircraft) through regular government laboratory analyses is illustrated. The film closes with a glimpse of developments in the treatment of water supplies, including the addition of fluorine.


Années
Primaire
5e primaire | 6e primaire
Secondaire
1re secondaire | 2e secondaire
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