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We think "Dynamo" could be the name of one of the X-Men. For the speaker in Howl, "machinery" can be a good thing when used as a metaphor for natural systems, or a bad thing when associated with war, authority, and technology.
Line 3: In two related metaphors, the stars are compared to a "dynamo," an awesome-sounding word for an electrical generator, which belongs to the "machinery" of night.
Line 33: A metaphor describing skeletons as "machinery." The people in the gymnasium are called "skeletons" because they are so skinny.