S1: | This weather-vane often tops a church spire, tower or high building. |
P : | They are only wind-vanes. |
Q : | Neither alone can tell us what the weather will be. |
R : | They are designed to point to direction from which the wind is coming. |
S : | Just as the barometer only tells us the pressure of air, the weather-vane tells us the direction of wind. |
S6: | The weather-vane can, however give us some indication of other. |
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