Horse collar and vacuum pump: what they have in common

1. Step 1. Horse collar — is part of — Horse collar. A rigid ring on the horse’s shoulders.
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 — has part — Piston pump. A fire pump is a piston pump.
5. Step 5. Piston pump — evolved into — Vacuum pump. Guericke adapted the piston pump to pump out air.

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