His book "Celtic Art: The Methods of Construction" was published in 1951. It had little impact at the time, but on its re-issue in 1971 it introduced a generation to Celtic knotwork, the Pictish stones, the Book of Kells and the Book of Durrow. As well as describing and illustrating over 200 historical examples, his book was notable for giving detailed instructions on creating similar designs, and encouraging their use in craftwork.
His son Ian, an engineer, later also wrote two books - "Celtic Knotwork" and "Celtic Key Patterns.