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description

Summary

A prototype horn loudspeaker driven by compressed air and an "artificial larynx" used as a portable public address system in Los Angeles, California, USA in 1929. The inventors tried to imitate human vocal cords. It could reportedly project voice or recorded music 4 miles. A vacuum tube audio amplifier powered 4 "artificial larynxes" which modulated compressed air going into the horn provided by a 50 HP gasoline engine and compressor. The owners rented out the powerful system for $300 per hour.

Caption: The external appearance of the truck carrying the speaker. A portion of the powerful system - generators and compressors - may be seen alongside the horn.

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Tags

1929 in los angeles horns loudspeakers public address systems sound trucks truck california
date_range

Date

01/05/1929
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Source

Wikimedia Commons
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Link

http://commons.wikimedia.org/
copyright

Copyright info

public domain

label_outline Explore Horns Loudspeakers, Public Address Systems, Truck

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Topics

1929 in los angeles horns loudspeakers public address systems sound trucks truck california