Stirrup leather and boiler: what they have in common

1. Step 1. Stirrup leather — is part of — Stirrup. A strap to the saddle.
2. Step 2. Stirrup — evolved from — Saddle. The stirrup added a foot support to the saddle.
3. Step 3. Saddle — is made of — Leather. A saddle is made of leather.
4. Step 4. Leather — is material for — Piston. They were sealed with a leather cup.
5. Step 5. Piston — is part of — Newcomen engine. Atmospheric pressure moves the piston.
6. Step 6. Newcomen engine — has part — Boiler. Steam from the boiler.

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