During his years in St Andrews, as well as supervising the work of constructing a thirty-seven-inch Schmidt-Cassegrain telescope, he wrote another important text Celestial mechanics (1958):
Sa kanyang mga taon sa St Andrews, pati na rin ang nangangasiwa sa mga gawain ng constructing ng tatlumpung-pitong-inch Schmidt-Cassegrain teleskopyo, he wrote isa pang mahalagang teksto ng makalangit mechanics (1958):