Cam and pneumatic tube: what they have in common

1. Step 1. Cam — is part of — Trip hammer. Cams on the shaft lift the hammer.
2. Step 2. Trip hammer — has part — Water wheel. The shaft was turned by a water wheel.
3. Step 3. Water wheel — evolved into — Turbine. The water turbine evolved from the water wheel.
4. Step 4. Turbine — is part of — Dental drill. An air-driven turbine handpiece.
5. Step 5. Dental drill — uses — Compressed air. Compressed air.
6. Step 6. Compressed air — is used in — Pneumatic tube. Air pressure.

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