The sound device most notable in the excerpt is assonance.
Assonance is the most notable sound device in the excerpt from 'Sea Fever' by John Masefield. Assonance is the repetition of vowel sounds within words in close proximity. In the line 'And quiet sleep and a sweet dream when the long trick's over,' the repetition of the 'e' sound in 'sweet,' 'dream,' and 'long' creates an assonant effect.
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