Search results
Results From The WOW.Com Content Network
The term “sounding board” is also used figuratively to describe a person who listens to a speech or proposal in order that the speaker may rehearse or explore the proposition more fully. [2] The term is also used inter-personally to describe one person listening to another, and especially to their ideas.
An acoustic board is a board made from sound absorbing materials, designed to provide sound insulation. [3] [4] Between two outer walls sound absorbing material is inserted and the wall is porous. Thus, when sound passes through an acoustic board, the intensity of sound is decreased. The loss of sound energy is balanced by producing heat energy.
Environmental acoustics work is usually done by acoustic consultants or those working in environmental health. [13] Recent research work has put a strong emphasis on soundscapes, the positive use of sound (e.g. fountains, bird song), and the preservation of tranquility. [18]
During World War I the need to detect submarines prompted more research into the use of sound. The British made early use of underwater listening devices called hydrophones , while the French physicist Paul Langevin , working with a Russian immigrant electrical engineer Constantin Chilowsky, worked on the development of active sound devices for ...
It continues in widespread use today in recreational boating and as an alternative to electronic echo sounding devices. Greek and Roman navigators are known to have used sounding leads, some of which have been uncovered by archaeologists. Sounding by lead and line continued throughout the medieval and early modern periods and is still commonly ...
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
Secondly, the surveyor can use a sound velocity probe that can be lowered into the water in the area to be surveyed to measure the actual speed of sound. This has the advantage of being quicker than a bar check and it can be performed when there is boat motion due to swell and sea, although any draft offset of the vessel is not identified using ...
Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.