Henry Edward Merritt MBE (20 May 1899 – 28 March 1974) was a British mechanical engineer who invented the Merritt–Brown triple differential tank transmission that provided greater manoeuvrability to a generation of British tanks, starting with the Churchill in 1939 and continuing into the 1980s. It allowed a tracked vehicle to change direction while on the move with less loss of power than under other steering systems, and to perform a neutral turn on the spot by rotating its tracks in opposite directions. Merritt's invention suited the faster pace of tank warfare of the Second World War, which contrasted with the more static trench warfare of the First World War, for which earlier generations of British tanks had been optimised.