Before Radar, Militaries Used Gigantic Headphones for Land-Based Sonar
Radar is howling , certain , but militaries did n’t always have the benefit of radiolocation to pinpoint foe locations . Before that , there was sonar . Underwater is one matter , though . On estate , you necessitate big victrola - like contraptions that looked uncomfortable as all hell . These acoustic locater wreak in much the same room as a submarine or bat ’s sonar would — through alive and peaceful echolocation ....