Modern
An alternative to the diving helmet that allows communication with the surface is the full face diving mask. These cover the diver's face and are held onto his head by adjustable straps.
"Diving helmet" sometimes means a hard safety helmet like a workman's helmet that covers the top and back of the head, but is not sealed. These may be worn with a full-face mask to provide impact protection.
During the First World War the British Army used a few diving helmets out of water as emergency protection from mustard gas.
Read more about this topic: Kirby Morgan
Famous quotes containing the word modern:
“A modern democracy is a tyranny whose borders are undefined; one discovers how far one can go only by traveling in a straight line until one is stopped.”
—Norman Mailer (b. 1923)
“In modern America, anyone who attempts to write satirically about the events of the day finds it difficult to concoct a situation so bizarre that it may not actually come to pass while his article is still on the presses.”
—Calvin Trillin (b. 1940)
“All modern American literature comes from one book by Mark Twain called Huckleberry Finn.... American writing comes from that. There was nothing before. There has been nothing as good since.”
—Ernest Hemingway (1899–1961)