National Museum of American History
Winlock & Huddleston Psychrometer
Huddleston, John S. F. · 1873
Patent model for Joseph Winlock and John S F. Huddleston, "Psychrometer," U.S. Patent 149,176 (March 31, 1874). Joseph Winlock was a professor of astronomy at Harvard College, and John S. F. Huddleston was a thermometer and barometer maker in Boston. The wet bulb thermometer is mounted on a brass plate that is marked "HUDDLESTON BOSTON" and graduated every degree Fahrenheit from +10 to +115. The dry bulb thermometer is missing.
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