Locating Devices before Radar was invented

Before the invention of radar to detect aerial means and the water court opponent could be using the speaker location (sound).

Radar is an object detection system that uses electromagnetic waves to identify the range, altitude, direction, or speed of both moving and fixed objects such as aircraft, ships, motor vehicles, weather formations, and terrain. The term RADAR was coined in 1941 as an acronym for radio detection and ranging.

Turning sound receptor - used as an "advanced" their own ears. Inventor Professor Meyer in 1880.

Acoustic marine locator Frenchman Jenie Oshera (Jean Auscher)

Experiments English mechanics Reva Bacon (Rev JM Bacon) 1898

English locator MK1 (1914-1918 biennium). Used in the First World War to detect enemy aircraft.

Four-"ears" locator. Date and manufacturer unknown.

Acoustic radar, kept the United States armed forces in 1921

Czech locator, 1920 (?). Two ears are vertical, two horizontal

Czech locator that can be used by one person.

English locator, 30's

Japanese locator, from the 30's

French locator, from the 30's

English locator, 1938

German Locator RRH, 1940

Mobile Locator U.S. Army (early 40's)

Ground and NOT MOBILE Location STATION SPEAKERS

England, 1928 10 meters concrete antenna.

England, in 1930 70 meters Locator-wall. Can "hear" aircraft flying at a distance of 100 km

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