United States April 2, 1925 Troops inspecting a newly-developed acoustic locator device, mounted on a wheeled platform. The large horns amplify the distant sounds of approaching enemy aircraft, enabling the aircraft defenders to derive their distance and altitude.
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Details
Creative#:
TOP29291296
Source:
達志影像
Authorization Type:
RM
Release Information:
須由TPG 完整授權
Model Release:
No
Property Release:
No
Right to Privacy:
No
Same folder images:
1920s1925AcousticLocationAdultsOnlyAlarmArchivalArmyEmergencySirenPlatformRadioWaveSurfaceAcousticWaveSensorUSAUnitedStatesUsMilitaryWheeledarmedforcesarmysoldierblackandwhitedangerdayexaminingholdinghornslargelargegroupofpeoplemilitarymilitaryuniformnoiseonlymenoutdoorsphotographyplayingsecurityskystandingteamworktogethernessvertical
1920s1925AcousticAcousticAdultsAlarmArchivalArmyEmergencyLocationMilitaryOnlyPlatformRadioSensorSirenStatesSurfaceUSAUnitedUsWaveWaveWheeledandarmedarmyblackdangerdayexaminingforcesgroupholdinghornslargelargemenmilitarymilitarynoiseofonlyoutdoorspeoplephotographyplayingsecurityskysoldierstandingteamworktogethernessuniformverticalwhite