Experimental 4 horn sound detector at Ellington Field, Houston, Texas. Elevation horns measure 15 ft, and azimuth horns measure 18 ft. Photograph taken in December 1918. This device was used for detecting and locating sound sources during World War I.

---

Size: 8486px × 5794px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 4, 1918, acoustic, activities, advancements, air, american, armed, azimuth, base, bases, deo., detecting, detection, detector, detectors, devices, early, elevation, ellington, equipment, experimental, experiments, field, forces, horn, horn-shaped, horned, horns, houston, innovations, installations, instruments, inventions, locating, military, noise, photographs, prototypes, research, show, sound, sound-based, states, technology, testing, texas, united, war, war-related, world