Dial with pointer and kite: what they have in common

1. Step 1. Dial with pointer — is part of — Kitchen scale. A weight indicator.
2. Step 2. Kitchen scale — has part — Spring. The load stretches a spring.
3. Step 3. Spring — is part of — Spring mattress. A spring unit.
4. Step 4. Spring mattress — is made of — Cotton. The cover is cotton fabric.
5. Step 5. Cotton — is material for — Glider. Covered with cotton fabric.
6. Step 6. Glider — evolved from — Kite. Lilienthal and Cayley studied the wing with kites and gliders.

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