Spear and mechanical clock: what they have in common

1. Step 1. Spear — evolved into — Harpoon. A spear with barbs.
2. Step 2. Harpoon — has part — Rope. A line connects the head to the hunter.
3. Step 3. Rope — is part of — Chip log. On a line with knots.
4. Step 4. Chip log — uses — Hourglass. The time of a speed measurement was taken with an hourglass.
5. Step 5. Hourglass — works like — Water clock (clepsydra). The same principle of timing by outflow, with sand instead of water.
6. Step 6. Water clock (clepsydra) — evolved into — Mechanical clock. Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.

Open Evothings