Microphone

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Ingenium, 1993.0222.001
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OBJECT TYPE: RIBBON/UNIDIRECTIONAL/TABLE
DATE: 1934
ARTIFACT NUMBER: 1993.0222.001

MANUFACTURER: RCA Mfg. Co. Inc.
MODEL: 77A
LOCATION: Camden, New Jersey, United States of America

More Information

General Information

Serial #: 1058
Part Number: 1
Total Parts: 1
AKA: N/A
Patents: N/A
General Description: ALUMINUM CASE; FABRIC SCREEN INSIDE HEAD; DURALUMINUM RIBBON; BRASS YOKE, THUMB NUTS & HEAD; FIBROUS INSULATION

Dimensions

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

Length: 13.7 cm
Width: 11.5 cm
Height: 33.5 cm
Thickness: N/A
Weight: N/A
Diameter: N/A
Volume: N/A

Lexicon

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

Manufacturer

AKA: RCA
Country: United States of America
State/Province: New Jersey
City: Camden

Context

Country: North America
State/Province: Unknown
Period: C.1934-1945
Canada: Unknown
Function: TO PICK UP SOUND, VOICE & MUSIC AND CONVERT TO COMPLEX ALTERNATING CURRENT. THE ALTERNATING CURRENT WOULD BE AMPLIFIED TO MODULATE A RADIO BROADCAST TRANSMITTER.
Technical: THE FIRST UNI-DIRECTIONAL OR CARDIOD PATTERN MICROPHONE. THE UNIDIRECTIONAL CHARACTERISTIC WAS A VERY POWERFUL TOOL IN OVERCOMING REVERBERATION & OTHER UNDESIRED SOUNDS, PARTICULARLY IN THE PICKUP OF SPEECH. 77AOFFERED FREQUENCY RESPONSE FROM 60 TO 10,000 CYCLES, AND 150-DEGREE PICK-UP ANGLE.
Area Notes: Unknown

Details

Markings: MFR'S PLATE: 'UNI-DIRECTIONAL MICROPHONE/ MI- 4040 1058 SER./ TYPE/ 77-A/ RCA [LOGO]/ U.S. PATENTS/ 1557356 1639713/ 1569411/ 1885001/ 1594802 1897732/ RE-19115/ REG. U.S. PAT. OFF./ MARCA REGISTRADA/ LICENSED ONLY FOR USES AUTHORIZED IN LEASE OR SALES AGREEMENT/ RCA Manufacturing Co., Inc./ 28355 CAMDEN N.J. U.S.A.'/ SCRATCHED ON BOTTOM: 'MRH'
Missing: NONE
Finish: PAINTED GLASS DARK BROWN
Decoration: N/A

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

RCA Mfg. Co. Inc., Microphone, circa 1934, Artifact no. 1993.0222, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/1993.0222.001/

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