Prism and turbine: what they have in common

1. Step 1. Prism — is part of — Spectroscope. A prism.
2. Step 2. Spectroscope — is used in — Helium. Helium was discovered by spectroscopy in the solar spectrum.
3. Step 3. Helium — is used in — Airship. After the Hindenburg — helium.
4. Step 4. Airship — has part — Propeller. Air propellers.
5. Step 5. Propeller — is part of — Ocean liner. Propellers.
6. Step 6. Ocean liner — has part — Turbine. Large liners run on steam turbines.

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