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San Bernardino, California. Cars being precooled at the ice plant. Air at a temperature of twenty degrees Fahrenheit is blown through the cars for twenty minutes in one direction, then in the other. Shippers specify the number of hours precooling required for their product. Sourced from the Library of Congress.
San Bernardino, California. Cars being precooled at the ice plant. Air at a temperature of twenty degrees Fahrenheit is blown through the cars for twenty minutes in one direction, then in the other. Shippers specify the number of hours precooling required for their product. Sourced from the Library of Congress.
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