Davis quadrant and aerosol can: what they have in common

1. Step 1. Davis quadrant — uses — Trigonometry. The Sun’s altitude is found from the angle of a shadow.
2. Step 2. Trigonometry — evolved from — Euclidean geometry. A development of geometry.
3. Step 3. Euclidean geometry — is used in — Weather station. Instruments are set up on a site according to a standard.
4. Step 4. Weather station — has part — Barometer. A barometer.
5. Step 5. Barometer — uses — Pressure. It measures pressure.
6. Step 6. Pressure — is used in — Aerosol can. A propellant gas.

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