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  David Crosthwait lifespan
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  He invented a new thermostat control, an improved boiler, a new differential vacuum pump and more effective heating systems for larger buildings.
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  Designed heating system for the Radio City Music Hall.
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  After retiring he taught a course on steam heating and control systems at Prudue University.
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  During the 1970's, he taught courses on steam heating theory and control systems.
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  He was also named Fellow of the AAAS and served as a member of the American Society of Heating, Refrigerating, and Air Conditioning Engineers, The American Chemical Society, and the National Society of Professional Engineers.
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  David Crosthwait passed away.