Leibniz’s stepped reckoner e tunnelling shield: o que têm em comum

1. Passo 1. Leibniz’s stepped reckoner — evoluiu para — Aritmômetro. Thomas’s arithmometer used Leibniz’s stepped drum.
2. Passo 2. Aritmômetro — tem como parte — Manivela. The handle for adding and subtracting.
3. Passo 3. Manivela — faz parte de — Steam locomotive. Connecting rods and cranks carry the piston stroke to the wheels.
4. Passo 4. Steam locomotive — utiliza — Railway track. It runs on rails.
5. Passo 5. Railway track — é utilizado em — Metro. It runs on rails.
6. Passo 6. Metro — utiliza — Tunnelling shield. Metro tunnels were built with shields.

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