Image - an illustration in black line work of a feminine presenting person sitting at a sink holding an arm up with a hairdryer drying their hair and another hand on a tap with a red line drawn from the hairdryer through the arms to the tap to the earth.
Image from a German book published in 1933 that show dangerous pathways for electrical shocks
I especially love the incongruity of the flapperish 1920s/30s detail of the ruffled slip, stockings and shoes offset against the clinical framework.
yeah, the details in this are to die for.
I posted some of these illustrations to my blog a few years ago! They are pretty great.