ENIAC and submarine: what they have in common

1. Step 1. ENIAC — has part — Vacuum tube. ENIAC contained about 18,000 vacuum tubes.
2. Step 2. Vacuum tube — includes — Magnetron. An electron vacuum device.
3. Step 3. Magnetron — is part of — Radar. The cavity magnetron made compact radar possible.
4. Step 4. Radar — works like — Sonar. The same echolocation principle: sound in water instead of radio waves.
5. Step 5. Sonar — is part of — Submarine. Underwater acoustics.

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