Large Dolezalek Electrometer (ca. 1910-1935)
A rather large (ca. 16" tall) and somewhat complex Dolezalek quadrant electrometer. Of unknown manufacture.
The quartz suspension fiber is missing but everything else is present and in good shape. The body and quadrants are made of polished brass. The vane, not visible, is metal-coated paper.
This electrometer has two sets of electrical connections for the quadrants. There is one connection for each quadrant on the top of the body, and one connection for each quadrant on the base. The support mechanism for the quadrants is fairly complicated—it allows a fine vertical adjustment of their height.