David Crosthwait, American engineer, inventor and writer (died 1976)

David Crosthwait

African-American mechanical and electrical engineer, inventor, and writer

David Nelson Crosthwait Jr. was an African-American mechanical and electrical engineer, inventor, and writer. Crosthwait's expertise was on air ventilation, central air conditioning, and heat transfer systems. He was responsible for creating heating systems for larger buildings…