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,
A Loud Silence A Loud Silence A Loud Silence is the first studio album by the Portuguese singer-songwriter and producer Renato Freitas, under the pseudonym Lizzy's Husband. It was recorded during 2013. Two singles were released from the album, "Petrichor" and "A Place for the Ghosts", with a music video for the first produced by Freitas, premiering on the national TV channel, RTP, music show "Poplusa". The album was released digitally under a Creative Commons license (Attribution-NonCommercial-NoDerivs 3.0 Unported (CC BY-NC-ND 3.0)). In December 2015, Bandcom created an online poll, "Best Portuguese Album of the Year", in which the album was included and