Are there barographs available which plot the first derivative of the pressure
with respect to time, and would such a plot be useful alongside the pressure
signal itself?
I have developed a barograph which is is capable of such things, but I wonder
what the most useful printout might be. The current state of the art is
visible at http://www.meteormetrics.com and I would welcome comment,
especially if there is a useful parameter I could calculate and include on
future versions.

Thanks
Kevin Scott