He was lucky enough to rub shoulders with a fellow student, Mr. W T. Newlyn, now lecturing on money at the University of Leeds, who was less of an engineer but more of a monetary theorist than himself. Together they discussed how monetary theory could be represented by an hydraulic model.
p. 10; As cited in: Mary S. Morgan (2012) The World in the Model: How Economists Work and Think, p. 194 - The balance of payments, 1951