I have a world that's set in the 1910s/1920s. The gist of it is that the hills of Connemara (in western Ireland) were once dwarven cities, but some are now occupied by orcs, and one of the many weapons that the dwarves are using to hold onto their remaining outposts and settlements are Tesla coils. These are crew-served static emplacements.
I have a physics degree, but it's been a while since I studied electrodynamics, so some of this may be wrong. The effectiveness of these coils is going to be determined by how much current they can send out as quickly as possible, which in turn is going to be proportional to their capacitance.
A few things that might help would be sending a stream of seawater towards the orcs and using it to direct the current, or increasing the number of capacitors. The salt content of seawater is apparently what makes it a decent conductor compared to air (4.80 as opposed to 10^-15, according to Wikipedia), and most of the villages around Connemara are based on the coast. Having multiple capacitors in parallel would increase the total capacitance, and thus increase the current.
Even with the above, which turns it into a giant stationary TASER-style weapon I think it would be ridiculously expensive and impractical compared to regular infantry. Is there anything I could do to make this more practical given the technology level of the time period, or would it just be a massive military boondoggle?