Pneumatic pushers and barrel: what they have in common

1. Step 1. Pneumatic pushers — is part of — Player piano. They press the keys when signalled by holes.
2. Step 2. Player piano — works like — Jacquard loom. A perforated medium controls a machine — a weaving one in one case, a musical one in the other.
3. Step 3. Jacquard loom — has part — Flying shuttle. A shuttle.
4. Step 4. Flying shuttle — is made of — Iron. With iron tips.
5. Step 5. Iron — is material for — Barrel. The staves are bound with iron hoops.

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