The usual practice in the 18th century was to have the movement between two parallel plates and the balance wheel outside the top plate.
The unit consists of two moving parallel plates mounted on force transducers.
Each assembly has two parallel plates joined with welded stringers.
Ground and Shell were enormous parallel plates that careened identically around her.
So the question is, how does one calculate the electric field between two charged parallel plates?
The parallel plates provide more surface for suspended oil droplets to coalesce into larger globules.
However, the parallel plates enhance the degree of oil-water separation.
For example, passing radio waves through parallel plates or by a magnet (or even the Earth's magnetic field).
In a spark chamber one looks at a stack of parallel plates edge-on.
A combination of two equal parallel infinite plates does not produce any gravity inside.