So many people have no idea what this gem is when I hand it to them... It is an original stage foot light! It is made of brass and recessed along the stage edge and when opened by the push of the small round button, the light is angled into place, the electric currents come in contact with each other and voila, curtain up, light the lights! I have one similar I mounted at the top of my staircase during our renovation of our 1929 home. I turn it on for my dogs each night when they when they want a glass of water and need to see their way or when company stay the night and they need to find their way. Dated July 5 1904. It still works too when Luca and I have connected it.