Octant and hydraulic press: what they have in common

1. Step 1. Octant — has part — Mirror. Two mirrors.
2. Step 2. Mirror — is made of — Silver. A silver coating.
3. Step 3. Silver — is material for — Syringe. Early needles were silver.
4. Step 4. Syringe — has part — Piston. A plunger.
5. Step 5. Piston — is part of — Hydraulic cylinder. The piston is moved by liquid.
6. Step 6. Hydraulic cylinder — is part of — Hydraulic press. Two cylinders of different diameters.

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