Twisted steel wire and camera: what they have in common

1. Step 1. Twisted steel wire — is part of — Barbed wire. Two twisted wires.
2. Step 2. Barbed wire — uses — Wire drawing. Wire is made by drawing.
3. Step 3. Wire drawing — is used in — Copper wire. Drawing.
4. Step 4. Copper wire — is part of — Electromagnet. A winding.
5. Step 5. Electromagnet — is part of — Bubble chamber. The field bends the tracks.
6. Step 6. Bubble chamber — has part — Camera. Photographing the tracks.

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