<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">topophones</topic></authority><related type="broader"><topic>sound devices</topic></related><variant type="other"><topic>topophone</topic></variant> <note xml:lang="en"><![CDATA[ Devices comprised of acoustic receivers positioned at right angles to one another and attached to a shaft that is held by the user. The sound collected by these horns is conducted to ear-pieces through rubber hoses. Developed to discover the position of the source of sounds in space, as invented ca.1880, particularly for use on ships to locate the position of foghorns. ]]></note></mads>