Printer and heron’s aeolipile: what they have in common

1. Step 1. Printer — uses — Ink. It prints with ink.
2. Step 2. Ink — is used in — Fountain pen. Ink.
3. Step 3. Fountain pen — is made of — Stainless steel. The nib of a modern fountain pen is stainless steel.
4. Step 4. Stainless steel — is material for — Water-jet propulsion. The impeller is stainless steel.
5. Step 5. Water-jet propulsion — uses — Reaction force. A jet of water.
6. Step 6. Reaction force — is used in — Heron’s aeolipile. Jets of steam spin the ball by reaction force.

Open Evothings