Harness traces and plumbing: what they have in common

1. Step 1. Harness traces — is part of — Horse collar. Straps to the shafts.
2. Step 2. Horse collar — is made of — Leather. The collar and traces are leather.
3. Step 3. Leather — is material for — Fire pump. The hoses were sewn from leather.
4. Step 4. Fire pump — evolved into — Fire truck. A pump on a motor-vehicle chassis.
5. Step 5. Fire truck — uses — Fire hydrant. Connection.
6. Step 6. Fire hydrant — uses — Plumbing. Plumbing.

Open Evothings