Chip log and barrel: what they have in common

1. Step 1. Chip log — uses — Hourglass. The time of a speed measurement was taken with an hourglass.
2. Step 2. Hourglass — uses — Gravity flow. Sand pours through under gravity.
3. Step 3. Gravity flow — is used in — Aqueduct. Water flows down a gradient without pumps.
4. Step 4. Aqueduct — has part — Arch. Roman aqueducts rested on arcades.
5. Step 5. Arch — works like — Barrel. Staves squeezed by hoops hold their shape by the same compression as the stones of an arch.

Open Evothings