Spindle shaft and rolling mill: what they have in common

1. Step 1. Spindle shaft — is part of — Spindle. The axis on which the thread is wound.
2. Step 2. Spindle — is part of — Spinning mule. The carriage holds hundreds of spindles.
3. Step 3. Spinning mule — evolved from — Arkwright’s water frame. A hybrid of two machines.
4. Step 4. Arkwright’s water frame — has part — Water wheel. Driven by water.
5. Step 5. Water wheel — is used in — Rolling mill. The first mills were turned by water.

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