Wooden yoke beam and camera: what they have in common

1. Step 1. Wooden yoke beam — is part of — Yoke. A crossbeam across the necks of two oxen.
2. Step 2. Yoke — is a kind of — Horse collar. A harness for oxen.
3. Step 3. Horse collar — is made of — Leather. The collar and traces are leather.
4. Step 4. Leather — is material for — Piston. They were sealed with a leather cup.
5. Step 5. Piston — is part of — Bubble chamber. It releases pressure.
6. Step 6. Bubble chamber — has part — Camera. Photographing the tracks.

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