Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
A man dressed in a suit and wearing a hat stands in a boiler room. He holds a handkerchief to his mouth and nose as smoke issues from a wooden apparatus. The face of another man, an official observer, is seen though the window of a closed door.
Copyright:
The National Library of Medicine believes this item to be in the public domain. (More information)