Arc gap regulator and heron’s aeolipile: what they have in common

1. Step 1. Arc gap regulator — is part of — Arc lamp. It brings the electrodes together as they burn away.
2. Step 2. Arc lamp — is made of — Graphite. Carbon electrodes.
3. Step 3. Graphite — is material for — Ion thruster. The grids are graphite or molybdenum.
4. Step 4. Ion thruster — uses — Reaction force. Jet thrust.
5. Step 5. Reaction force — is used in — Heron’s aeolipile. Jets of steam spin the ball by reaction force.

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