Mechanical television and rock drill: what they have in common

1. Step 1. Mechanical television — evolved into — Television. Electronic TV replaced mechanical TV.
2. Step 2. Television — uses — Iconoscope. The camera tube.
3. Step 3. Iconoscope — is made of — Silver. The target is a mosaic of silver grains with caesium.
4. Step 4. Silver — is material for — Syringe. Early needles were silver.
5. Step 5. Syringe — has part — Piston. A plunger.
6. Step 6. Piston — is part of — Rock drill. A percussion piston.

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