Pinned cylinder and incandescent light bulb: what they have in common

1. Step 1. Pinned cylinder — works like — Punched card. Pins on a cylinder and holes in a card are two ways of recording a sequence for a machine.
2. Step 2. Punched card — is used in — ENIAC. ENIAC’s input and output went through IBM punched-card equipment.
3. Step 3. ENIAC — has part — Vacuum tube. ENIAC contained about 18,000 vacuum tubes.
4. Step 4. Vacuum tube — is made of — Tungsten. The cathode is a tungsten filament.
5. Step 5. Tungsten — is material for — Incandescent light bulb. A tungsten filament (since 1904–1910).

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