Brass quadrant electrometer consists of four quarter-cylindrical brass boxes (quadrants ) each mounted on a glass insulating pillar. The whole is housed within an electrostatic shield (Faraday cage) - a beehive shaped wire cage enclosure (aka a “bird cage”). The quadrants and cage stand on a round base platform on three legs with levelling screws (tribach base?). Arising from the platform is a separate vertical rod arises from the periphery and terminates over the axis of cylindrical symmetry and from which provision is made for a conducting suspension fibre which supports the horizontal “paddle” which is free to rotate within the cylindrical cavity of the four quadrants. The suspension and paddle are unfortunately missing.Label on front: “Natural Philosophy Laboratory No. University of Melbourne” Engraved on front: “Elliott Bros London”

Brass and glass case enclosing two sets of coils; surmounted by a vertical rod on which a compensating (?) magnet may be moved either vertically or rotated in a horizontal plane; 3 levelling screws and spirit level.Engraved on top of cylinder: “Nalder Bros and Co., Westminster No. 36521”

Demonstration model: Metal cylindrical instrument has three tubes attached to body with a glass disc in one tube (= viewing port). Large part of instrument is cut away. Model part of accelerator beam line. Bolt holes on the base and top of instrument for attachment into vacuum lines.