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سطر 496:
* 1883: First accurate electricity meter (''Pendelzähler'') by Hermann Aron<ref>{{حوالہ کتاب|title=A Practical Guide to Energy Management of Facilities and Utilities|last=Energywise Consortium|publisher=Smithers Rapra Technology|year=2011|isbn=978-1847355980|location=|pages=79}}</ref>
* 1886: Discovery of anode rays by Eugen Goldstein<ref>{{حوالہ کتاب|url=https://archive.org/details/measuringmassfro0000unse/page/4|title=Measuring mass: from positive rays to proteins|last=Grayson|first=Michael A.|publisher=Chemical Heritage Press|year=2002|isbn=0-941901-31-9|location=Philadelphia|pages=[https://archive.org/details/measuringmassfro0000unse/page/4 4]}}</ref>
* 1887: Discoveries of [[برقناطیسی اشعاع|electromagnetic radiation]], [[ضیا برقی اثر|photoelectric effect]] and [[ریڈیائی لہر|radio waves]] by Heinrich Hertz<ref>{{حوالہ ویب|url=https://www.thoughtco.com/heinrich-hertz-4181970|title=Heinrich Hertz Proved Existence of Electromagnetic Waves|last=Petersen|first=Carolyn Collins|date=4 January 2019|website=ThoughtCo|language=en|accessdate=18 December 2019|archive-date=2020-10-15|archive-url=https://web.archive.org/web/20201015193901/https://www.thoughtco.com/heinrich-hertz-4181970|url-status=dead}}</ref>
* 1887: First parabolic antenna by Heinrich Hertz<ref>{{حوالہ کتاب|title=Antenna Theory and Design, 3rd Ed|last=Stutzman|first=Warren L.|last2=Thiele|first2=Gary A.|publisher=John Wiley & Sons|year=2012|isbn=978-0470576649|location=|pages=391–392}}</ref>
* 1893–1896: Wien approximation (1896)<ref>{{حوالہ رسالہ|last=Wien|first=W.|title=On the division of energy in the emission-spectrum of a black body|pages=214–220}}</ref> and Wien's displacement law (1893)<ref>{{حوالہ کتاب|title=The Historical Development of Quantum Theory|last=Mehra|first=J.|last2=Rechenberg|first2=H.|publisher=Springer-Verlag|year=1982|isbn=978-0-387-90642-3|location=New York City|pages=}}</ref> by [[ویلیم وین|Wilhelm Wien]]
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