Liquefied natural gas and electrical telegraph: what they have in common

1. Step 1. Liquefied natural gas — uses — Cryogenics. Liquefaction.
2. Step 2. Cryogenics — is used in — Superconducting magnet. Cooling with liquid helium.
3. Step 3. Superconducting magnet — is a kind of — Electromagnet. An electromagnet.
4. Step 4. Electromagnet — is part of — Electrical telegraph. Morse’s receiver.

Open Evothings