History of the Water Supply of the World / arranged in a comprehensive form from eminent authorities, containing a description of the various methods of water supply, pollution and purification of waters, and sanitary effects, with analyses of potable waters, also geology and water strata of Hamilton county, Ohio, statistics of the Ohio river, proposed water supply of Cincinnati.

by Thomas J. Bell

TEMPERATURE OF WELLS.

Invariably the temperature of water from great depths is higher than at the surface, this being due to some unknown source of heat in the interior of the globe.

In Scotland, the rate of increase of temperature, after permanent degree has been attained, is about one degree Fahrenheit for every forty-eight feet of descent.

At Grenelle, the temperature was found to be 1.8 degrees for every 106 feet of descent below the point of constant temperature.

The average rate of increase of temperature is one degree for a descent of from forty to fifty feet.

The temperature of the boring at Columbus increased, below the permanent line, one degree in every seventy-one feet.