Bertram Hopkinson, CMG, FRS, (11 January 1874 – 26 August 1918) was a patent lawyer and Professor of Mechanism and Applied Mechanics at Cambridge University. In this position he researched flames, explosions and metallurgy and became a pioneer designer of the internal combustion engine.
Hopkinson was born in Birmingham, in 1874, the son of John Hopkinson an electrical engineer. He studied at Trinity College, Cambridge, and became a lawyer after his graduation. Following the death of his father, brother and two of his sisters in a mountaineering accident in 1898, Hopkinson switched to a career in engineering instead.
In 1903 Hopkinson was elected to the Cambridge chair in mechanism and applied mechanics, and in 1910 he was elected a Fellow of the Royal Society.
During World War I he was commissioned into the Royal Engineers, and opened a research establishment at Orford Ness where he and his team researched weapons, sights, and ammunition. He learnt to fly and died on 26 August 1918 when his Bristol Fighter crashed en route from Martlesham Heath to London.
He is buried in the Parish of the Ascension Burial Ground in Cambridge, with his wife Mariana, née Siemens; they had seven daughters.
- "Hopkinson, Bertram (HPKN891B)". A Cambridge Alumni Database. University of Cambridge.
- In 1915, Hopkinson discovered a similarity relation between the masses of explosive charges and their effects at a given distance. See: Hopkinson, B. (1915) British ordnance minutes, 13563. The same similarity relation was discovered independently in 1925 by Karl Julius Cranz in Germany. See: Cranz, Karl Julius, Lehrbuch der Ballistik (Berlin, Germany: Julius Springer, 1926), vol. 2 ("Innere Ballistik"), pages 174 ff.
- Oxford Dictionary of National Biography: Hopkinson, Bertram (1874–1918) by Jacques Heyman
- Bertram Hopkinson at Find a Grave
- Biography at the University of Cambridge
-  Biography at King's College London
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