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: Diving Helmet
Famous quotes containing the word modern:
“The way in which modern German poetry follows theories reminds me of pupils who, scolded by their teacher for their insubordination, justify themselves by saying that they invented new rules of propriety according to which they are quite well- behaved.”
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