Ader no-diaphragm receiver
Datecirca 1878
Inventory Number8052a
ClassificationTelephone
Subject
Maker
Clement Ader
1841 - 1926
Cultural Region
Place of Origin
Dimensions9.8 × 6.1 × 5.2 cm (3 7/8 × 2 3/8 × 2 1/16 in.)
Material
DescriptionA telephone receiver design without a diaphragm, by French inventor Clement Ader. Device consists of a frame made of four brass bars which supports a dish-shaped rubber earpiece and brass tapered cylinder at one end and a pair of flat brass disks with a tapered cylinder at the other end. A brown jacket of material surrounding the tapered cylinder furthest from the earpiece is cracked and chipped.
Connecting the two ends is an iron rod supporting small spool wound with wire, which attaches, with two coils of wire, to two brass binding posts. The binding posts, each with a knurled-edge thumb adjustment screw, are mounted on one of the brass bars, and protrude out of the frame.
Connecting the two ends is an iron rod supporting small spool wound with wire, which attaches, with two coils of wire, to two brass binding posts. The binding posts, each with a knurled-edge thumb adjustment screw, are mounted on one of the brass bars, and protrude out of the frame.
Signedunsigned
Curatorial RemarksItems 8052a and b are very similar.
FunctionConversion of electrical impulses into sound for output by telephone
ProvenanceJefferson Laboratory, Physics Department, Harvard University
Date: 1890-1930
Object number: RS1425a
U.S. Electrical Supplies
Date: 1910-1920
Object number: 1997-1-0578
See also/See also
