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After graduating from Cambridge, Collar joining the Aerodynamics Department at the National Physical Laboratory in Teddington, where he worked on propellors, airship dynamics, wind-tunnel design, and especially on flutter and matrix analysis.
In 2013 the UK National Physical Laboratory used microwave and acoustic resonance measurements to determine the speed of sound of a monatomic gas in a triaxial ellipsoid chamber to determine a more accurate value for the constant as a part of the revision of the International System of Units.
Bullard held a chair at the University of Toronto from 1948–50 and was head of the National Physical Laboratory between 1950 and 1955.
Well known artworks include, "The Fundamental Units", a collaboration with the National Physical Laboratory imaging the world's lowest domination coins to massive scale using the latest microscopes.
In 2012, a research team from the National Physical Laboratory and Imperial College London developed a way to make a solid-state maser operate at room temperatures by using pentacene-doped p-Terphenyl as the amplifier medium.
After university he worked at the Royal Arsenal, Woolwich in their workshop and was there until January 1911 when he joined in the Aerodynamics Department of the National Physical Laboratory at Teddington and then at Armstrong Whitworths where he worked on the design of airships until the outbreak of war in 1914.
In the 1920s, Walter Stanley Stiles, a young physicist at the National Physical Laboratory in Teddington, England, examined the effects of street lighting and headlight features on automobile traffic accidents, which were becoming increasingly prevalent at the time.
He was at the National Physical Laboratory until 1977, working with his colleague John E. Martin.