Engineering was redefine in 1948 which is when it became “Applied Science’. It was a political move, in order to increase funding for Research and Development. It worked. Funding for the pure sciences was waning at a time when all the funding was going towards Engineering.
By placing Engineering under the category of Science allowed the theoretical research to continue in the sciences while the engineering kept building the bridges, making the up and coming computers. Otherwise, the Research arm would’ve withered and died off. It was the age of “let’s get practical” and pure research does not show immediate practical results ,sometimes never, sometimes immediately, but it’s not guaranteed.