hammer blow
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English
Noun
hammer blow (plural hammer blows)
- A blow with a hammer.
- (rail transport) A pounding of the rails by the driving wheels of a steam locomotive caused by the inertia of unbalanced parts.
- 1959 September, P. Ransome-Wallis, “The British Railways Class "9" 2-10-0s”, in Trains Illustrated, page 419:
- The balancing of the engine is unusual, with the rotating masses fully balanced and 40 per cent of the reciprocating masses statically balanced by lead weights in the coupled wheels; the reciprocrating balance weights are in the same phase on both sides of the engine. This system saves balance weight and reduces the wheel hammer-blow.
Alternative forms
References
- “hammer blow”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.
- “hammerblow”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.