Science: Water Clock

UNIVERSITY OF CHICAGO Research Institute requires 30 gal. samples of city of Chicago water at least five yrs. and not more than 20 yrs. old. Phone Midway 3-0800, Ext. 2502, or write 5640 Ellis-av.

For three days the classified ad ran in Chicago newspapers. It brought in no gallons of stale water. A Decatur cistern was tapped for a 29-year-old sample. The water heater of a high-school teacher in Oak Park yielded 30 gallons between five and twelve years old. An undertaker emptied his fire extinguisher and a grocer drained the soda pop cooler...

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