Dolphin became the Managing Director of the Corgi Motorcycle Co Ltd. in 1946 and also set up Dolphin Industrial Developments Ltd, and Hydraulic Developments Ltd, which he ran until 1950 when he became Chief Engineer at the Atomic Weapons Research Establishment from 1951 to 1957.
Dolphin became the Managing Director of the Corgi Motorcycle Co Ltd. in 1946. Dolphin set up Dolphin Industrial Developments Ltd. Dolphin set up Hydraulic Developments Ltd. He ran until 1950. He became Chief Engineer at the Atomic Weapons Research Establishment from 1951 to 1957.