Vehicle horn horn. Bicycles often have a classic "bulb horn", operated by squeezing a rubber bulb attached to a metal horn. Squeezing the bulb forces air through a steel reed located in the throat of the horn, making it vibrate, producing a single note. The flaring horn matches the acoustic impedance of the reed to the open air, radiating the sound waves efficiently, making the sound louder. Other types of horns used on bicycles include battery-operated horns (sometimes even car horns on 12-volt circuits are incorporated) and small air horns powered by a small can of compressed gas. Oliver Lucas of Birmingham,
The Sound of His Horn a classic of the genre. Literary critic Peter Nicholls has described it as "a fine story, well-told in a clear, evocative, almost formal prose." Thomas M. Disch ranked "The Sound of His Horn" at number twelve in his list of the all-time greatest fantasy stories. The book was also included by David Pringle in his book "" and by Stephen Jones and Kim Newman in their "Horror: 100 Best Books". The Sound of His Horn The Sound of His Horn is a 1952 dystopian time travel/alternative history novel by the senior British diplomat John William Wall, written under the pseudonym