Demonstration Model of an Early Carbon Grain Microphone, c. 1900

Demonstration Model of an Early Carbon Grain Microphone, c. 1900 With series resistor and switch, wood base stamped with no. 188937. Demonstrationsmodell eines frühen Kohle-körnermikrophons,

2 Intercom Telephones and Switch by L.M. Ericsson, c. 1900 1) Battery ringing telephone, model BC 1100, polished walnut base, single bell, push button ringing, carbon grain microphone with speaking ho

German Wall-mounted Model M 1900 Telephone, c. 1900 Walnut case, Berliner-type carbon microphone with speaking horn, 3-part crank inductor, 2 spoon-shaped earphones by Schuchhardt, double bell. Deutsc

Early Wall Telephone by L.M. Ericsson, c. 1890 Stockholm, model 301, fixed carbon microphone, Bell-type handset, 3-part crankinductor, double bell, lightning protection, ornate walnut case, writing de

Early Wall Telephone by L.M. Ericsson, c. 1890 Stockholm, model 325, fixed carbon microphone, Bell-type handset, 3-part induction coil, double bell, lightning protection, ornate walnut case, writing d

Early Wall Telephone by L.M. Ericsson, c. 1890 Stockholm, model 301 (new no. AB 210), fixed carbon microphone no. 570 on arm, Bell-type handset, 3-part induction coil, double bell, lightning protectio

Early Wall Telephone by L.M. Ericsson, c. 1890 Stockholm, model 301, fixed carbon microphone no. 570, Bell-type handset, three-part induction coil (missing one section), double bell, lightning protect

Bell Telephone Demonstration Model, c. 1900 Manufacturer: E. Leybold's Nachfolger, Coeln-Rhein. Open-works telephone model for demonstrating the mechanism, on mahogany base, very good original condit

Group of Physical Demonstration Models, c. 1900 1) Wimshurst's influence machine, Trüb, Fierz & Cie., Zurich, height 14 ½ in., complete, rubber straps need to be renewed. - 2) 8 chromic acid

4 Interesting Physical Demonstration Models, c. 1900 1) Ebert's phosphorescent lamp with 2 electrodes. – 2) Crookes' apparatus for experiments on radiant matter. – 3) Crookes' radiometer. – And:

2 Electrostatic Induction Demonstration Models, c. 1900 Glass balls with hanging gold strips, conductors on the top, height 7 ½ and 9 7/8 in. 2 Demonstrationsmodelle "Influenz-Elektrizität", um 1900

3 Early Microphones 1) Carbon rod microphone, c. 1895, no. 6101, probably by Friedrich Reiner, Munich, with wood membrane, walnut case. - 2) Carbon granulate microphone, c. 1895, unmarked, speaking ho

2 Telephone Microphones and 1 Receiver 1) Universal Transmitter, J. Berliner, Hanover/Vienna, c. 1893, carbon grain microphone with carbon disc diaphragm, original lacquered papier-mâché hor

Ampère Table, c. 1900 Physical demonstration model, used for experiments on the relationship between magnetic fields and electric currents, probably France, with pole changer, overall height 15 3/4 i

Electromagnetic Motor with Geissler Tube, c. 1900 Physical demonstration model, for tubes up to 6 in., overall height 8 in. Elektromagnetischer Motor mit Geißler'scher Röhre, um 1900 Physikalisches

Bavarian Wall Telephone by Wetzer, c. 1900 Hermann Wetzer, Pfronten. No. 1180, walnut case M 1899, carbon microphone by Friedrich Reiner in Munich, 3-part crank inductor, 2 Bell-type earphones. Bayeri

Four Wall Telephones, c. 1910-30 1) Friedrich Reiner, Munich. Marked on carbon-grain microphone and Bell-type receiver, walnut case, 3-part crank inductor. - 2) Unmarked, two-piece walnut case, 2-part

Bavarian Wall Telephone by Heller, c. 1900 Friedrich Heller, Nuremberg. No. 9572, walnut case, height-adjustable carbon microphone by Friedrich Reiner in Munich, 3-part crank inductor, 2 Bell-type ear

Bavarian Wall Telephone by Zettler, c. 1900 Alois Zettler, Munich. No. 5308, walnut case, height-adjustable carbon microphone by Friedrich Reiner in Munich, 3-part crank inductor, Bell-type earphone,

Swiss Wall Telephone by Hasler, c. 1895 G. Hasler, Bern. Walnut case, carbon grain microphone with speaking horn, single bell, bakelite Bell-type receiver, marked on the earpiece "Telegraphen-Werkst&#

Bavarian Wall Telephone Station by Reiner and Spare Parts, c. 1900 Friedrich Reiner, Munich. 1) Wall telephone, walnut case, missing upper part, three-part crank inductor, double bell, carbon grain mi

3 Early Microphones 1) Carbon bar microphone, 1889 onwards, no. 830, Mix & Genest, Berlin, with wood membrane. - 2) Carbon disk microphone, c. 1895, R. Stock & Co., Berlin, brass case. - And: 3) Berli

Early Radio Receiver, c. 1925 Demonstration model, ebonite plate, 2 tubes (RE134, A408), Audio Frequency Transformer Type R-12, plug-in coil, swivel coil, variable capacitor, 2 potentiometers, size 3

Early Electric Motor, c. 1900 Probably experimental model, open construction, ring armature, with belt drive, height 12 ¼ in. Früher Elektromotor, um 1900 Vermutlich Versuchsmodell, offene Bauweise,