History of Women's 1920s Fashion - 1920 to 1929 - Glamour Daze

19 Million Marks, 1 Sabotaged Jetliner: The Costliest Mistake in 1920s Aviation

Pretty high tech for 1920's. On April 1929 at Ft Humphreys VA, the Army ran night trials with a sound locator unit directly synced to a 60-inch searchlight. Two listeners—one handling azimuth/direction, one elevation—turned hand wheels to align twin horns on an approaching airplane's drone using binaural hearing. Angles fed into an acoustic corrector that adjusted for sound delay, wind, and air conditions. Corrected bearings then streamed electrically to automatically swing the searchlight beam

1920s Music: Jazz in the Roaring Twenties