Related Object Info
Ader "bull ring" receiver
An Ader telephone receiver, made by Louis-Clément Breguet for the Ader company. The receiver is known as a "bull ring" type, because of its shape. The receiver housing is made of nickel-plated brass and steel and consists of two flat metal disks, stacked to form a short cylinder.
Around the edge of the back cylinder is inscribed, "[star] STE GLE DES TELEPHONES [star]." On the back face is inscribed, "SYSTEME ADER BTE S.G.D.G.; between the magnet poles is inscribed, "BREGUET No 3705."
A hard rubber fluted mouthpiece/earpiece is centered on the outer face of the front cylinder. A piece of the edge of the mouthpiece/earpiece is broken off.
On the opposite side is a ring-shaped magnet which serves as a handle, and a pair of metal binding posts with slotted head screws. The ring shape of the magnet was designed to create a strong magnetic field by bringing both magnet poles near the vibrating diaphragm located under the circular opening on the face of the earpiece, and increase its sensitivity.
A pair of green cloth-covered electrical cords is attached to the binding posts. The cords are joined along most of their length and terminate in two ends, each end finshed with a metal electrical pin plug.
