Rain collecting funnel and rocket: what they have in common

1. Step 1. Rain collecting funnel — is part of — Rain gauge. It collects precipitation over a known area.
2. Step 2. Rain gauge — is made of — Bronze. Korean rain gauges (1441) are bronze.
3. Step 3. Bronze — is material for — Heron’s aeolipile. The aeolipile is a bronze ball.
4. Step 4. Heron’s aeolipile — uses — Reaction force. Jets of steam spin the ball by reaction force.
5. Step 5. Reaction force — is used in — Rocket. A rocket moves by reaction force.

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