937,395. Capacitors. K. BUTTNER, and H. POENSGEN, [trading as STETTNER & CO.]. May 1, 1962 [May 2, 1961], No. 16718/62. Class 37. A variable capacitor comprises a cylindrical insulating flat stator with a conductive plate mounted on the surface thereof an insulating rotor disc rotatable coaxially to the stator having a conductive plate mounted on the side remote from the stator plate; the plates being shaped for capacitance variation with mutual rotation; resilient means maintaining one side of the rotor plate in close contact with the stator plate and a connector contacting either the rotor or the stator plate comprising at least a portion of a sheet-metal cylinder coaxial with and surrounding the stator and fixed axially in relation thereto by projections engaging recesses of the stator In Figs. 1, 2 a cylindrical ceramic stator disc 1 is bored centrally for spindle 3 carrying ceramic rotor disc 2 formed on its outer face with a conductive layer 7 contacting the spindle head. A similar conductive layer is formed on the upper surface of the stator adjacent the rotor disc, and the layers are shaped so that mutual rotation of the discs effects capacity variation. Connection to the stator layer is by annular sheet metal member 4 (Fig. 5) having projections 4b, 4c which is fitted over a shoulder of the underside of the stator disc with projections 4b bent into opposed recesses 9 of the stator to contact its conductive layer and projection 4c bent downwards as a connection tag. A silicon rubber disc 5 abuts resiliently on the stator and is retained by annular disc 6a having downward projections 6b, centrally held by the flanged end of the rotor spindle 3. The disc 5 is replaceable by a steel or bronze cup spring and insulating disc. In a modification (Figs. 6 to 10, not shown) stator connection is by a sheet-metal cylinder surrounding the stator body and engaging a shoulder thereof with upwardly-extending connecting projections bent over into recesses of the stator body and a downwardly extending connection tag. In a further modification (Fig. 11) rotor disc 22 overlies cupped stator 21 whose conductive coating is connected to flanged tube 24 passing through a central bore. A part-cylindrical bridging yoke 26 contains the rotor and stator, and is secured to the latter by tags 26c bent into recesses of the underside. A laminated spring 25 between the bridge member of the yoke and a flange 23a of the spindle of the rotor holds the latter in position and connects its coating to the yoke body, while the slotted shank 23 of the spindle passes through a guide bearing of the yoke.