<?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">oscilloscopes</topic></authority><related type="other"><topic>oscillographs</topic></related><related type="broader"><topic>electricity measuring devices</topic></related><variant type="other"><topic>oscilloscope</topic></variant> <note xml:lang="en"><![CDATA[ Devices in which the variations in a fluctuating electrical quantity appear temporarily as a visible wave form on a display screen. These plot the relationship between these variations, with the horizontal axis normally being a function of time and the vertical axis the voltage generated by an input signal. The German physicist Ferdinand Braun developed the first cathode-ray oscilloscope in 1897. In general, these are considered the same instrument as an oscilloscope, except that the oscillograph may be capable of creating a permanent record of measurements, while the oscilloscope provides only visual feedback. ]]></note></mads>