More sensitive instrument as leaf deection is unaffected by air
currents or by charges residing on the case. Reacts only to charges
which are intentionally brought near or put on them.
Comprised of a box made of
aluminium with two transparent
glass windows to shut out air
currents and a plated metal support
rod entering from the top through a
polyethylene insulator. Two leaves
of thin aluminium foil are suspended
from the support rod. Supplied with
three pairs of aluminium leaves.