Kitchen scale and knife: what they have in common

1. Step 1. Kitchen scale — has part — Spring. The load stretches a spring.
2. Step 2. Spring — is part of — Automaton. The mainspring stores the energy.
3. Step 3. Automaton — has part — Cam. Cams set the figures’ movements.
4. Step 4. Cam — is part of — Sewing machine. Cams drive the fabric feed.
5. Step 5. Sewing machine — evolved into — Overlocker. A specialized sewing machine.
6. Step 6. Overlocker — has part — Knife. A knife for trimming the edge.

Open Evothings