Question
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 points to direction from which the wind is coming.
S: Just as the berometer 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.
The proper sequence should be: