Winding windlass and heron’s aeolipile: what they have in common

1. Step 1. Winding windlass — is part of — Catapult. It draws the lever.
2. Step 2. Catapult — uses — Elasticity. A torsion catapult stored energy in twisted skeins.
3. Step 3. Elasticity — is used in — Spring. A spring works through the elasticity of its material.
4. Step 4. Spring — is part of — Vending machine. A spring holds the dispenser.
5. Step 5. Vending machine — was inspired by — Heron’s aeolipile. Heron described both a holy-water dispenser and the aeolipile; the dispenser is the prototype of the vending machine.

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