<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31307671</termId><termName>opeidoscopes</termName><termType>PT</termType><termNote><![CDATA[ Instruments that give visual representation of sounds, consisting of  tubes closed at one end by a taught membrane with a small mirror attached to its centre, which vibrates in response to sound entering the tube at the open end, causing a spot of light reflected by the mirror on to a screen to vibrate with varying amplitude and frequency. ]]></termNote><termCreatedDate>2026-03-30 20:22:48</termCreatedDate><relation><relationType>UF</relationType><termId>31307672</termId><termName>opeidoscope</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31299038</termId><termName>sound devices</termName><termType>PT</termType></relation></term>  </Zthes>