Crosthwait, David Nelson Jr.

1898 - He was born on the 27th of May in the city of Nashville, Tennessee.

1913 - He graduated from Purdue University.

1920-1930 - Crosthwait invented a new vacuum pump, an improved boiler, and a new thermostat control. All of which were more effective in the heating systems for larger buildings.

1930-1971 - David became the Technical Advisor of Durham-Bush, Inc.

         - He wrote an instruction manual and guides for heating and cooling with water and guides, standards, and codes that dealt with heating, air conditioning, and ventilation systems.

1970 - He taught at Purdue University.

1975 - Crosthwait was granted and an honorary doctoral degree.

1976 - David Crosthwait died.