However, the development of echo sounding largely displaced both of these technologies by the beginning of the twenty-first century.
13.
In 1920 he founded the " Behm Echo Sounding Company " in Kiel in order to commercialise his invention.
14.
In 1955 he organized an inspection of Freifjorden; using echo sounding it was possible to survey the depth of the fjord.
15.
When active sonar is used to measure the distance from the transducer to the bottom, it is known as echo sounding.
16.
Echo sounding is a more rapid method of measuring depth than the previous technique of lowering a sounding line until it touched bottom.
17.
"Abosso " was a motor ship, with two eight-cylinder NHP . Her navigation equipment included wireless direction finding and an echo sounding device.
18.
Depth measurements via echo sounding by the research ship " Polar Queen " showed water depths between 170 and 355 meters at the islands'purported location.
19.
On the way back to Europe, the aircraft carrier conducted oceanographic, biological and meteorological observations and every fifteen to thirty minutes echo soundings were taken.
20.
Traditionally conducted by ships with a sounding line or echo sounding, surveys are increasingly conducted with the aid of aircraft and sophisticated electronic sensor systems in shallow waters.
