Seed drill e vacuum pump: o que têm em comum

1. Passo 1. Seed drill — utiliza — Grain. It sows grain in rows.
2. Passo 2. Grain — é utilizado em — Grain elevator. It stores and transfers grain.
3. Passo 3. Grain elevator — tem como parte — Watt steam engine. Dart’s first elevator was steam-driven.
4. Passo 4. Watt steam engine — evoluiu de — Piston pump. The first steam engines (Newcomen’s) pumped water out of mines by driving pumps.
5. Passo 5. Piston pump — evoluiu para — Vacuum pump. Guericke adapted the piston pump to pump out air.

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