Homemade Plane-spotting "Ear" Built of Low-Cost Parts
Item
Showing how easy it is to build a “tin ear” to spot the approach of air raiders, Dr. Donald A. Wilbur of Rensselaer Polytechnic Institute, Troy, N. Y., hastily assembled a simple instrument from low-cost parts. It would be possible to construct similar locators for local air-raid spotters throughout the country without great expense. The detector, made up of a few boards, a large tin horn from an old phonograph, a microphone, a battery-operated amplifier and a pair of ear phones, is capable of picking up the sound of bombers five to ten miles distant.
- Title (Dublin Core)
- Homemade Plane-spotting "Ear" Built of Low-Cost Parts
- Article Title and/or Image Caption (Dublin Core)
- Homemade Plane-spotting "Ear" Built of Low-Cost Parts
- Language (Dublin Core)
- Eng
- Temporal Coverage (Dublin Core)
- World War II
- Date Issued (Dublin Core)
- 1942-04
- Is Part Of (Dublin Core)
-
Popular Mechanics, vol. 77, n. 4, 1942
- pages (Bibliographic Ontology)
- 13
- Rights (Dublin Core)
- Public domain
- Source (Dublin Core)
- Google books
- Archived by (Dublin Core)
- Enrico Saonara
