Biplane struts and bracing wires and gutenberg printing press: what they have in common

1. Step 1. Biplane struts and bracing wires — is part of — Biplane. They tie the wings into a rigid box.
2. Step 2. Biplane — has part — Propeller. A tractor propeller.
3. Step 3. Propeller — uses — Screw. A propeller “screws” itself into the water, like an Archimedes’ screw.
4. Step 4. Screw — is used in — Screw press. The force is produced by turning a screw.
5. Step 5. Screw press — is part of — Gutenberg printing press. Gutenberg adapted the screw press known from pressing grapes.

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