Leather and vacuum pump: what they have in common

1. Step 1. Leather — is material for — Fire pump. The hoses were sewn from leather.
2. Step 2. Fire pump — has part — Piston pump. A fire pump is a piston pump.
3. Step 3. Piston pump — evolved into — Vacuum pump. Guericke adapted the piston pump to pump out air.

Open Evothings