"David-Crosthwait"(May 27,1898-May 1976)

Was an  African American mechanical electrical engineer,inventor,and writer.He was born in the city of Nashville Tennessee.David grew up in Kansas City, Missouri.Once he completed high school he received a Bachelor of Science (1913) and a Masters of Engineering (1920) from Purdue University.He was granted an honorary doctoral degree in 1975.He died one year later.David expertise was on air ventilation,central air conditioning,and heat transfer.With knowledge David created many different heating systems,refrigeration methods,temperature regulating devices,an vacuum pumps.For these inventions he holds 39 U.S. patents,as well as 80 international patents.In the 1920s,& 1930s,David invented a vacuum pump,a boiler,and a thermostat control,all for more effective heating systems for larger buildings.Some of his greatest accomplishments were for creating the heating systems for the Rockefeller Center and New York's Radio City Music Hall.David later 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.After retiring in 1971,David began to teach a course on steam heating theory and control systems at Purdue.