Photographic flash and Babbage’s Analytical Engine: what they have in common

1. Step 1. Photographic flash — has part — Capacitor. Energy is stored in a capacitor.
2. Step 2. Capacitor — is part of — RAM. A DRAM bit is stored in a tiny capacitor.
3. Step 3. RAM — evolved from — Magnetic-core memory. DRAM displaced core memory.
4. Step 4. Magnetic-core memory — is part of — Mainframe. Magnetic-core memory.
5. Step 5. Mainframe — uses — Punched card. Programs were entered on punched cards.
6. Step 6. Punched card — is used in — Babbage’s Analytical Engine. Operations and numbers were entered on punched cards.

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