Plumb bob and aeroplane: what they have in common

1. Step 1. Plumb bob — has part — Rope. A suspension fibre.
2. Step 2. Rope — is part of — Kite. The line holds the kite and passes the tension to the hand.
3. Step 3. Kite — evolved into — Glider. Lilienthal and Cayley studied the wing with kites and gliders.
4. Step 4. Glider — evolved into — Aeroplane. The Wrights added an engine to a glider.

Open Evothings