<?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">quincke&apos;s tubes</topic></authority><related type="broader"><topic>sound devices</topic></related><variant type="other"><topic>quincke&apos;s tube</topic></variant><variant type="other"><topic>tubes, quincke&apos;s</topic></variant> <note xml:lang="en"><![CDATA[ Instruments used to demonstrate the interference of sound, consisting of two U-tubes, one sliding into the other, with a Galton's whistle at one intersection of the tubes and a sensitive flame at the other. Air passes through the two bends of the tube to meet at the flame, and the flicker is analyzed against a scale on one of the tubes. ]]></note></mads>