We found a reference in Wainwright's Guide to this memorial to a man who was following the Blencathra Foxhounds in 1880.
https://en.wikipedia.org/wiki/High_Seat_(Lake_District)#Litt's_Memorial I'd seen pictures on the Internet and was expecting something like two gateposts because no idea of scale was given. They were much smaller than expected being only knee high. They were much further down the hill than expected, being just over the top of the steep valley of the stream that separates from Raven Crag.
The unusual set up reminded me of the parallel plates of a capacitor. The equation for capacitance is
With air between, Er = 1. The plates were exactly 2 metres apart. The stones were 60cm by 25cm. That means that were they metal and isolated, they would have a capacitance of 0.67 picoFarads.
