He worked on the numerical solution of partial differential equations at a time when numerical linear algebra was performed on a desk calculator. Computational efficiency and accuracy was thus even more important than in the days of electronic computers. Some of this work was published after the end of the Second World War jointly with his supervisor Richard Southwell.
At that period, he focused on solving partial differential equations numerically, utilizing a manual calculator for linear algebra computations. Given the limited computing power at the time, computational efficiency and accuracy became even more vital than in the era of electronic computers. Some of this research was co-published with his supervisor Richard Southwell after World War II.