Ader finger-ring receiver
Date1881
Inventory Number8079
ClassificationTelephone
Subject
Inventor
Clement Ader
1841 - 1926
Maker
Société Générale des Téléphones
?
1880 - 1889
Cultural Region
Place of Origin
Dimensions3.8 × 3.8 × 4 cm (1 1/2 × 1 1/2 × 1 9/16 in.)
Material
DescriptionA compact handheld French telephone receiver, known as a "watchcase" type for its shape, designed by Clement Ader.
The device consists of a short metal cylinder, with a screw-mounted cap at either end, attached by screws. A split metal finger ring is attached by a screw-mounted bracket to one side, in the center of a circular depression; a trumpet-shaped hard rubber earpiece is attached to the opposite side. There are two ends of green cloth-covered electrical wire visible near the ring attachment, protruding from a circular opening in the receiver housing. The rubber earpiece has a center hole, through which a diaphragm can be seen. The receiver is designed to work with a transmitter known as a "carbon pencil transmitter," which uses a row of carbon rods connected in series.
Inside support ends are marked "N" and "P"; support & brass back is stamped "1"
The device consists of a short metal cylinder, with a screw-mounted cap at either end, attached by screws. A split metal finger ring is attached by a screw-mounted bracket to one side, in the center of a circular depression; a trumpet-shaped hard rubber earpiece is attached to the opposite side. There are two ends of green cloth-covered electrical wire visible near the ring attachment, protruding from a circular opening in the receiver housing. The rubber earpiece has a center hole, through which a diaphragm can be seen. The receiver is designed to work with a transmitter known as a "carbon pencil transmitter," which uses a row of carbon rods connected in series.
Inside support ends are marked "N" and "P"; support & brass back is stamped "1"
Signedunsigned
InscribedInside mag. support ends marked: N / P;
mag. support & brass back stamped: 1
FunctionConversion of electrical impulses into sound for output by telephone
ProvenanceJefferson Laboratory, Physics Department, Harvard University
L. M. Ericsson
Date: circa 1879
Accessories: Ivory signaling rattle
Object number: 8014c
