Some Issues (which I'm about to attempt to partially fix) 

1. The gold-leaf and quadrant electrometers are in a sense, also repulsion electrometers; they both work by measuring the repulsion of the same charge in one way or another.

2. My 1861 chem textbook uses the name "quadrant electrometer" to describe a considerably simpler device than Kelvin invented. This device has an index which goes between 0 and 90 degrees (hence a quadrant) while Kelvin's device, while I don't fully understand it, had a drum split into quadrants. So I conclude that this is a coincidence. 

The best solution I can think of is to create a section of repulsion electrometers, and then describe the types individually in their own sections underneath, e.g. gold-leaf, Dellmann, Peltier, Bohnenberger. I will rename "quadrant electrometer" to "Kelvin's quadrant electrometer", and then put both his and the simpler one under "repulsion electrometers".

Hopefully we can make this article clearer and neater.