Fume hood and telescope: what they have in common

1. Step 1. Fume hood — has part — Electric fan. A fan.
2. Step 2. Electric fan — has part — Propeller. The blades.
3. Step 3. Propeller — is part of — Torpedo. Propellers.
4. Step 4. Torpedo — has part — Gyroscope. Obry’s gyroscope keeps the course.
5. Step 5. Gyroscope — is part of — Space telescope. Pointing gyroscopes.
6. Step 6. Space telescope — is a kind of — Telescope. A space telescope is a telescope above the atmosphere, so air does not blur the view.

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