This is a kind of double Carré machine combining friction and induction. There is a large ebonite disk at the center that receives the charges from a pair of disks placed on the sides. One is a glass disk, rubbed by a silk cushion, the other an ebonite disk, rubbed by a fur cushion. The charges are induced by two brass collectors set at the edges of the disks, where they overlap with the central disk. The charges are then collected by two brass spheres—one for the positive charge, the other for the negative charge—connected by a glass tube secured to a brass support. This type of generator is exceptionally rare.