All workplaces have safety warnings, but nowadays they are rarely illustrated with anything besides simple icons. The Dutch took a different track. Between the 1920s and the 1960s, work safety posters were designed by well-known artists who tried for a clean and inviting look, but nevertheless instilled horror at the sight of possible mutilation and death that could result in not being careful and following safety procedures. The poster above was designed by Herman Heijenbrock in 1928. Yes, he could have made it bloodier, but it gets the point across as it is.
In this 1940 poster by Endre Lukács, disaster hasn't struck yet, but you see it in your mind's eye anyway. Other posters warn of the dangers of high voltage lines (hoogspanning), carbon monoxide, spitting, neglecting your safety harness, petting a cat without gloves, and carrying large pots of food while wearing high heels. See a collection of fetching 20th-century Dutch safety posters from a Dutch archive at 50 Watts. And more of them here. -via Kottke