Entladungsgefäß einer <a href="https://de.wikipedia.org/wiki/Quecksilberdampflampe" class="extiw" title="de:Quecksilberdampflampe">Quecksilberdampf-Hochdrucklampe</a>
<a href="//commons.wikimedia.org/wiki/User:%D0%94.%D0%98%D0%BB%D1%8C%D0%B8%D0%BD" title="User:Д.Ильин">Д.Ильин</a>: vectorization, translation
2020-08-12
<a rel="nofollow" class="external text" href="http://lamptech.co.uk/Documents/M1%20Introduction.htm">The Mercury Vapour Lamp</a>