PARABOLIC MICROPHONE 1960 HowTo Build PLANS Birdwatching Spy

Description

PARABOLIC MICROPHONE 1960 HowTo Build PLANS Birdwatching Spy
PARABOLIC MICROPHONE 1960 HowTo Build PLANS Birdwatching Spy
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Description
Plans to build a Parabolic Microphone. Made from a childs disc sled this Low Cost Unit can pick up sounds hundreds of feet away - Whispers at 100 feet, and normal speech at 150 feet. Great for birdwatchers, wildlife lovers and amateur sleuths.
The microphone used with the reflector can be the ordinary microphone for your tape recorder or you can listen in with earphones and adjust the reflector for the best sound pick up.
Simple construction using only common hand tools and easily obtained odds and ends of materials.
This is an original 3 page magazine article from 1960.
Pages measure 6 1/2” x 9”
We do not photocopy these.
Article Includes
Measured Drawings and Diagrams
Complete Instructions
Materials List
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Rates:
.00 for USPS first class / or media mail service
.70 for priority mail service.
.00 for Canadian shipping
.00 other International shipping
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