Spear-thrower and bellows: what they have in common

1. Step 1. Spear-thrower — uses — Spear. It throws darts.
2. Step 2. Spear — evolved into — Fire lance. The fire lance was a spear with a tube of gunpowder — the first step to firearms.
3. Step 3. Fire lance — uses — Gunpowder. A gunpowder charge.
4. Step 4. Gunpowder — is made of — Charcoal. Gunpowder is a mix of saltpetre, sulphur and charcoal.
5. Step 5. Charcoal — is used in — Bloomery. The ore was reduced with charcoal.
6. Step 6. Bloomery — has part — Bellows. Bellows blew in air for a high temperature.

Open Evothings