From Acme Whistles, a smaller version of their professional Bobby Whistle, perfect for a college student's keychain. SOME ACME HISTORY: 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.