Before Sir David McMurtry invented the touch trigger probe, it was extremely difficult for engineers to measure anything non-linear. He was working on the Olympus engines for Concorde at the time, in 1972 - which means that before then the accuracy of engineering on Concorde, and everything else, could only be calculated using a slide-rule, an invention of the 18th century. Sir David went on to found Renishaw, whose precision measuring devices can be found in engineering workshops the world over. Sir David's invention ushered in the possibility of mass manufacturing to identical spec - indeed, he made today's world of manufacturing possible.