| 词条 | Double hammer |
| 释义 |
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] References1. ^{{Cite book|title=The Encyclopædic Dictionary|author=Robert Hunter|publisher=Cassell, Petter, Galpin and Co.|page=171|year=1883|url=https://books.google.com/?id=YYIVAAAAYAAJ&dq=%22double+hammer%22+music}} 2. ^{{Cite book|title=The Manufacture of Steel|author=Louis Emmanuel Gruner|author2=Lenox Smith|publisher=D. Van Nostrand|year=1872|page=55|url=https://books.google.com/?id=PyNDAAAAIAAJ&dq=%22double+hammer%22+metallurgy}} 3. ^{{Cite book|title=A Manual of Mining|author=Eugene Benjamin Wilson|edition=4|publisher=John Wiley & Sons|page=628|year=1905|url=https://books.google.com/books?id=dycxAAAAMAAJ&q}} 1 : Metalworking tools |
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