Fast breeder reactor and railway semaphore: what they have in common

1. Step 1. Fast breeder reactor — uses — Isotopes. Breeding plutonium.
2. Step 2. Isotopes — is used in — Mass spectrometer. It discovered the isotopes of stable elements.
3. Step 3. Mass spectrometer — uses — Electromagnet. Deflecting ions with a field.
4. Step 4. Electromagnet — is part of — Relay. An electromagnet switches the contacts.
5. Step 5. Relay — is part of — Traffic light. Relay controllers.
6. Step 6. Traffic light — evolved from — Railway semaphore. The first traffic light was a railway-style semaphore.

Open Evothings