Synopsis
ELEMENTARY SCHOOL TEACHER TAKES CLASS ON FIELD TRIP TO CITY WATERWORKS. GUIDE EXPLAINS PLANT OPERATION--STORAGE TANKS, LABORATORY WATER TESTING FOR PURITY, FILTRATION, CHEMICAL TREATMENT. PUMPS SUPPLY FIRE DEPARTMENT, STREET CLEANING, LAUNDRY.
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Details
- Running time
- 10 minutes
- Collection
- Prelinger Archives