Public domain
Fuel oil conservation. An experienced serviceman checks the efficiency of the family heating plant. This man measures the draft, the amount of heat lost through the chimney, and the carbon dioxide content of the flue gases. His work resulted in cutting down fuel consumption more than nineteen per ce
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Credit lineFuel oil conservation. An experienced serviceman checks the efficiency of the family heating plant. This man measures the draft, the amount of heat lost through the chimney, and the carbon dioxide con. 1942-01-01. Perlitch, William, United States. Office Of War Information. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
