Following my work in the Bell Labs in the US, I chased my idea of electronic enciphering in speech of the telephone system. In the later part of war I moved to work for the Secret Service Radio Security Service at Hanslope park. There I developed further knowledge of electronics with the help of the engineer Donald Bayley. Together we undertook the job of designing and constructing a secure voice communications machine called Delilah. It was intended to do many things but it wasn't able to be used for long distance radio transmissions and was built too late to be used in the war. Though the system did work, and I demonstrated it to officials by encrypting and decrypting a recording of Winstion Churchill.
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