Engineering:Double hammer
From HandWiki
A double hammer is a forging implement used in metallurgy. It operates on puddle balls and blooms by hitting both sides at the same time.[1] Double hammers are made of two blocks attached to rollers which facilitate opposing movement along a set of rails.[2] Double hammers are normally operated by three people at a time: one holding the instrument in place and the other two moving the blocks back and forth.[3]
References
- ↑ Robert Hunter (1883). The Encyclopædic Dictionary. Cassell, Petter, Galpin and Co.. p. 171. https://books.google.com/books?id=YYIVAAAAYAAJ&q=%22double+hammer%22+music.
- ↑ Louis Emmanuel Gruner; Lenox Smith (1872). The Manufacture of Steel. D. Van Nostrand. p. 55. https://archive.org/details/manufacturestee02smitgoog. "double hammer metallurgy."
- ↑ Eugene Benjamin Wilson (1905). A Manual of Mining (4 ed.). John Wiley & Sons. p. 628. https://archive.org/details/amanualminingba00ihlsgoog.
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