In 1883 the London Police were looking for an idea to replace the hand rattle. Inspired by a sound derived from his violin, Joseph Hudson created the perfect sounding whistle for police use. A slightly jarring, discordant trill, that would be unique and far-carrying. When tested by the Metropolitan Police in London, the whistle was heard over a mile away and immediately adopted as the official whistle of the London Bobby. It can still be seen on duty in the streets of London, and occasionally even heard. This makes a very nice gift!