Copper Nail

From Cities

Uses

Construction of Small Boat, Caravel, Speed Boat, Survey Vessel and Trawler.

Can be used as a weapon: 2 damage, -20% to hit. Effective against Treemen. The nail is used up in the attack.

Construction

Fire 2AP	Piece of Wood
Unit of Charcoal
Fire 4AP	4 Units of Charcoal	Copper Ore
100 Bits of Copper
Fire 1AP	10 Bits of Copper
Copper Nail

Volume discounts for nail construction: 1AP to make 1, 7AP to make 10, 49AP to make 100. Presumably, making 1000 nails would take 343AP with this progression. However, at most 100 nails can be made at a time.

I think there's some rounding down in the volume discount - it shows 48AP to make 100 copper nails for my fire-aligned character.