Wimperis was born on 27 August 1876 to Joseph Price Wimperis, an Australian merchant, and Jemima Samuel in Edmonton, London. He started his studies at Royal College of Science and then moved to Gonville and Caius College, Cambridge as an advanced student in 1898. During this period he became a Whitworth Scholar, wrote a series of engineering books covering internal combustion, road transport and air navigation. Among his many inventions and works are the Wimperis accelerometer of 1909, the first accelerometer rugged enough for use measuring the performance of automobiles. He was directed to Elliott Brothers for manufacture, and this started a long relationship between Wimperis and the company. The same year they introduced a gyroscopic turn indicator, and followed this with an optical speedometer, rate of roll indicator, indicated airspeed calculator and his famed bombsights. Wimperis was commissioned as a lieutenant in the Royal Naval Volunteer Reserve on 7 September 1915. Between 1915 and 1925, Wimperis worked in the Experimental Office in the Royal Navy Air Service. Here he was put on the problem of devising a useful bombsight that did not require manual calculations or a stopwatch to estimate the wind speed. The result was his Drift Sight, which used a small bar that was aligned with the motion of objects on the ground to measure the wind. He then greatly expanded on this design in his Course Setting Bomb Sight in 1917, introducing the first system to allow bomb runs from any direction, instead of just up or down the wind line. The CSBS has been called "the most important bombsight of the war". Through this period he also worked for the Royal Air Force after it formed in 1918, and the Air Ministry as it took over most of the centralised research for both arms. He was appointed Director of Scientific Research in the Air Ministry in 1925. In June 1934, Albert Percival Rowe, Wimperis' personal assistant, became concerned about the state of air defence in the UK, and took it upon himself to read every study on the topic published in the UK. The result was a memo stating that "we were likely to lose the war if it starts within the next ten years". Wimperis took the memo seriously and set about creating the Committee for the Scientific Study of Air Defence, placing Henry Tizard in the chairman's position. This group was instrumental in the creation of radar in the UK, and the Chain Home system that was instrumental to winning the Battle of Britain. In 1938 Wimperis served as the Aeronautical Advisor to the Council for Scientific and Industrial Research of the Commonwealth of Australia, advising them on setting up their own aeronautical research division. He served as President of the Royal Aeronautical Society, 1936–1938, and of the Engineering Section of the British Association, 1939. In 1945, Wimperis was President of the Whitworth Society 47-years after becoming a Scholar. From 1946 to 1950 he was a member of the Atomic Energy Study Group, Chatham House. His wife, Grace d'Avray Parkin, was the daughter of Canadian George Robert Parkin. They married on 28 September 1907 and had three daughters. Wimperis died in Edinburgh on 16 July 1960 at the age of 83.
