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Transmitter - Experimental Telephone, Alexander Graham Bell, 1876 Object Reg. No: ST 035632

Summary:
Bell double- pole magneto transmitter, constructed in the first half of 1876

This transmitter (or microphone) was used for experiments by Alexander Graham Bell, probably manufactured by Thomas Watson. The transmitter was used in conjunction with the harmonic telegraph receiver. It was acquired by Bell's uncle E. S. Symonds during a visit to the Bell family in Brantford, Ontario and taken by Symonds to Australia.

In a typical experiment, a transmitter was connected by wires to a receiver. Someone then spoke loudly into the transmitter -- loudly because the transmitter was very inefficient. This caused the diaphragm (indicated) to vibrate, producing electric currents in a coil. The currents then travelled along wires to a receiver, which converted the currents back into sound.
Description:
Varnished wood base. brass terminals, dual pole electromagnet wound with green silk- covered wire on black bobbin, with ebonite covers. Round brass diaphragm stretcher with three thumbscrews for adjustment. Electromagnet resistance 10 ohms. In wooden box.
Acquisition Information:
Loan & Subsequent Donation from Mr Charles Moody
Discipline: Technology
Dimensions: 170 mm (Height), 160 mm (Width), 265 mm (Length)

More information

Tagged with: telephones
Themes this item is part of: Information & Communication Collection
Primary Classification: COMMUNICATIONS
Secondary Classification: Telephony
Tertiary Classification: telephones
Past Owner: Mr Edward Symonds, Melbourne, Victoria, Australia

Past Owner or User.
User: Mr Alexander Bell, Boston, Massachusetts, United States of America, 1876
Manufacturer (Probable): Mr Thomas Watson, United States of America, 1876

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