All of the nouns used (hammer, chain, furnace, brain, anvil) are explaining mighty things that the tiger is being compared to. The poem is simply saying that they are smart, speedy, and strong.
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Hello Here is the link i made for you read article and you will find your answer to your question
A book was the first ever object that the martian was able to describe. The book was compared to the Caxton. The martian described the Caxton as having a lot of wings and the wings serve as the pages of the book.
Hope my answer has come to satisfy your query.