Touch hole and vacuum pump: what they have in common

1. Step 1. Touch hole — is part of — Cannon. Igniting the charge.
2. Step 2. Cannon — is part of — Ironclad. Artillery.
3. Step 3. Ironclad — has part — Watt steam engine. Steam engines.
4. Step 4. Watt steam engine — evolved from — Piston pump. The first steam engines (Newcomen’s) pumped water out of mines by driving pumps.
5. Step 5. Piston pump — evolved into — Vacuum pump. Guericke adapted the piston pump to pump out air.

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