Trebuchet sling and steam turbine: what they have in common

1. Step 1. Trebuchet sling — is part of — Trebuchet. It lengthens the throw.
2. Step 2. Trebuchet — is made of — Stone. It hurled stone balls.
3. Step 3. Stone — is material for — Interferometer. Michelson’s instrument stood on a stone slab.
4. Step 4. Interferometer — has part — Mirror. Mirrors.
5. Step 5. Mirror — is part of — Solar concentrator. Mirrors concentrate the light.
6. Step 6. Solar concentrator — has part — Steam turbine. Heated steam turns a turbine.

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