The process of the Invention of the refrigerator started in the 18th century. In 1748, William Cullen of the University of Glasgow developed a process for creating an artificial cooling medium. An American inventor Oliver Evans designed the first refrigerator in 1804. In 1843, Jacob Perkins built the first refrigeration machine in Great Britain. In 1844, a physician John Gorrie built a working unit. He constructed it to create cooling atmosphere for his patients who were suffering from yellow fever. In 1876, Carl von Linden invented the improved method of liquefying gas.