Headband and barrel: what they have in common

1. Step 1. Headband — is part of — Bit and bridle. Straps on the head.
2. Step 2. Bit and bridle — is made of — Leather. A bridle is leather straps.
3. Step 3. Leather — is material for — Helmet. Helmet liners and simple helmets were made of leather.
4. Step 4. Helmet — has part — Dome. A protective shell.
5. Step 5. Dome — evolved from — Arch. A dome is an arch rotated around an axis.
6. Step 6. Arch — works like — Barrel. Staves squeezed by hoops hold their shape by the same compression as the stones of an arch.

Open Evothings