Discussion
Which instrument arrangement gives the pressure gradient at a point?
Answer: C
A pressure gradient is a spatial derivative, so it requires simultaneous readings from several stations rather than a time series from one. A barograph gives the local tendency, which is a quite different quantity used for the isallobaric wind. A radiosonde gives a vertical profile at one location. Inferring the gradient from the wind reverses the usual logic and would be circular if the balance is what is being tested. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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