Transmitter, telephone

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Ingenium, 1969.0587.001
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OBJECT TYPE
ELECTROMAGNETIC/BOX/WALL
DATE
1877
ARTIFACT NUMBER
1969.0587.001
MANUFACTURER
Unknown
MODEL
Unknown
LOCATION
United States of America

More Information


General Information

Serial #
N/A
Part Number
1
Total Parts
1
AKA
N/A
Patents
N/A
General Description
CAST IRON FRAME, STEEL MAGNET ASSEMBLY, BRASS CLAMPING BARS, COTTON COVERED MAGNET WIRE SOLINOIDS

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length
15.0 cm
Width
11.0 cm
Height
6.5 cm
Thickness
N/A
Weight
N/A
Diameter
N/A
Volume
N/A

Lexicon

Group
Communications
Category
Telephony
Sub-Category
N/A

Manufacturer

AKA
Unknown
Country
United States of America
State/Province
Unknown
City
Unknown

Context

Country
North America
State/Province
Unknown
Period
1877 TO 1887
Canada
PATENTED BY ALEXANDER GRAHAM BELL IN 1877, BASED ON RESEARCH CARRIED OUT AT BRANTFORD, ON. & BOSTON, MA.
Function
USED TO CONVERT VOICE SOUNDS INTO VARYING ELECTRIC CURRENT BY THE ACTION OF A STEEL DIAPHRAGM VARYING THE MAGNETIC FIELD SUPPLIED BY THE LARGE MAGNET ASSEMBLY. IT COULD ALSO BE USED AS A RECEIVER WITH VARYING CURRENT APPLIED TO THE COILS WHICH WOULD INCREASE & DECREASE THE MAGNETIC FIELD & THUS CAUSE THE STEEL DIAPHRAGM TO MOVE, PRODUCING SOUND.
Technical
FIRST TYPE OF TELEPHONE TRANSMITTER IN COMMERCIAL SERVICE, 1877-1878. IT CONSISTED OF A METAL DIAPHRAGM FIXED IN THE FIELD OF A PERMANENT MAGNET WITH A VOICE COIL WOUND AROUND THE MAGNET'S POLES. VIBRATION OF THE DIAPHRAGM BY SOUND WAVES CAUSED A VARIATION OF THE MAGNETIC FIELD & INTRODUCED A VARYING CURRENT IN THE VOICE COIL, WHICH WAS TRANSMITTED OVER A TELEPHONE WIRE. IT WAS SOON SUPERSEDED BY THE CARBON VARIABLE RESISTANCE TRANSMITTER, WHICH PROVIDED MORE POWERFUL SIGNALS.
Area Notes
Unknown

Details

Markings
'36' WRITTEN IN WHITE PAINT ON FRONT OF CASTING
Missing
DIAGRHAM, MISC. HARDWARE AND WALL MOUNTING CASE
Finish
FRAME, BLACK ENAMEL
Decoration
N/A

CITE THIS OBJECT

If you choose to share our information about this collection object, please cite:

Unknown Manufacturer, Transmitter, telephone, circa 1877, Artifact no. 1969.0587, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/1969.0587.001/

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