A photo of a dual intensity light bulb intended for marine beacon usage that has been partially screwed into a socket. The photo was taken during a visit to the <a href="https://en.wikipedia.org/wiki/Museum_of_American_Heritage" class="extiw" title="w:Museum of American Heritage">Museum of American Heritage</a> where the light bulb and socket were on display.
<a href="//commons.wikimedia.org/wiki/User:Gazebo" title="User:Gazebo">Gazebo</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>