Microphone

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Ingenium, 1969.0825.001
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OBJECT TYPE: CARBON/MICA DIAPHRAGM
DATE: 1922
ARTIFACT NUMBER: 1969.0825.001

MANUFACTURER: MARCONI WIRELESS TELEGRAPH CO.
MODEL: MARCONI-REISZ
LOCATION: United Kingdom

More Information

General Information

Serial #: N/A
Part Number: 1
Total Parts: 1
AKA: N/A
Patents: N/A
General Description: MARBLE CASE/ MICA DIAPHRAGM ENCLOSING A SQUARE CAVITY/ 2 CARBON BLOCKS/ 2 SCREWS ON BACK CONNECTED TO SCREWS ON BLOCKS/ 3 LOADING HOLES TO INSERT CARBON GRANULES INTO CAVITY CAPPED BY BRONZE SCREW CAPS/ 2 BRONZE SUPPORTING BRACKETS/ BAKELITE FRAME HOLDING MICA DIAPHRAGM

Dimensions

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

Length: 14.0 cm
Width: 10.2 cm
Height: 8.9 cm
Thickness: N/A
Weight: N/A
Diameter: N/A
Volume: N/A

Lexicon

Group: Communications
Category: Sound
Sub-Category: N/A

Manufacturer

AKA: MARCONI
Country: United Kingdom
State/Province: Unknown
City: Unknown

Context

Country: England
State/Province: Unknown
Period: 1922-1935
Canada: Unknown
Function: TO PICK UP SOUND, VOICE AND MUSIC AND CONVERT TO COMPLEX ALTERNATING CURRENT. THE ALTERNATING CURRENT WOULD BE AMPLIFIED TO MODULATE A RADIO TRANSMITTER.
Technical: AN INTERESTING DEVIATION FROM THE CARBON BUTTON WHERE A METAL DIAPHRAGM CAUSED RESISTANCE BETWEEN DIAPHRAGM & THE BACK OF THE BUTTON TO VARY WITH SOUND PRESSURE. THIS TYPE CAUSED THE LATERAL RESISTANCE TO CHANGE ACROSS A CARBONFILLED CHAMBER. LARGER AREA & SOFT PACKING WAS PROBABLY WHAT LET THEM CLAIM IMPROVEMENT IN * COM
Area Notes: Unknown

Details

Markings: NO MARKINGS
Missing: DAMAGED MICA DIAPHRAGM/ 2 MOUNTING SCREWS BROKEN OFF/ AN ADDITIONAL SQUARE FRAME THAT SUPPORTS A PROTECTIVE CLOTH COVER OVER THE DIAPHRAGM
Finish: NATURAL MARBLE CASE - WHITE WITH MOTTLED GREY/ BLACK BAKELITE/ HARDWARE DARK BRONZE COLOUR
Decoration: N/A

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

MARCONI WIRELESS TELEGRAPH CO., Microphone, circa 1922, Artifact no. 1969.0825, Ingenium – Canada’s Museums of Science and Innovation, http://collections.ingeniumcanada.org/en/id/1969.0825.001/

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