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.
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Famous quotes containing the word modern:
“No idea is so antiquated that it was not once modern. No idea is so modern that it will not someday be antiquated.”
—Ellen Glasgow (1874–1945)
“He was naturally so sensitive, and so kind. But he had the insidious modern disease of tolerance. He must tolerate everything, even a thing that revolted him.”
—D.H. (David Herbert)
“The medieval university looked backwards; it professed to be a storehouse of old knowledge.... The modern university looks forward, and is a factory of new knowledge.”
—Thomas Henry Huxley (1825–1895)