On 20 February 1856, Lieutenant Frederick E.B. Beaumont of the Royal Engineers was granted a British patent for improvements to the Adams revolver which allowed them to be cocked and fired either cocking the hammer as in Colt single-action revolvers, or by just pulling the trigger.
As a lieutenant, Beaumont saw service during the Crimean War, and was one of only a small number of British officers who served with Turkish forces along the Danube, serving with the (local) rank of Captain in the Turkish Contingent Engineers, for which service he was awarded the Turkish Crimean War medal rather than the British Crimean War Medal.
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