Radio broadcasting and Babbage’s Analytical Engine: what they have in common

1. Step 1. Radio broadcasting — uses — Radio. Broadcasting by radio.
2. Step 2. Radio — includes — Car radio. A radio receiver.
3. Step 3. Car radio — has part — Vacuum tube. The first car radios used vacuum tubes.
4. Step 4. Vacuum tube — is part of — ENIAC. ENIAC contained about 18,000 vacuum tubes.
5. Step 5. ENIAC — uses — Punched card. ENIAC’s input and output went through IBM punched-card equipment.
6. Step 6. Punched card — is used in — Babbage’s Analytical Engine. Operations and numbers were entered on punched cards.

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