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,
Tim Key. With a String Quartet. On a Boat. does feature the c-word) and Key's album is not as laugh-out-loud funny as the genius of Pete and Dud." Wolf, however, also said, "the poems are funny no matter what the length" and that, "There are many moments of mirth and it is a worthwhile listen." Sam Walby of Drowned in Sound did have criticisms saying, "that Key is sometimes too deadpan for his own good, making his one-line pieces a little stilted. A case in point is the three poems about Bob ('Bob And The Pipe', 'Bob And The Octopus' and 'The Tragedy of Bob'), which might work on