Space under floor on brick pillars and CNC machine: what they have in common

1. Step 1. Space under floor on brick pillars — is part of — Hypocaust. A space under the floor on brick pillars.
2. Step 2. Hypocaust — evolved into — Central heating. The Roman hypocaust was an early central heating system.
3. Step 3. Central heating — is made of — Cast iron. Radiators are cast iron.
4. Step 4. Cast iron — is material for — CNC machine. The bed is cast iron.

Open Evothings