| 1. | The echo sounding was introduced in the 1930s to determine water depth.
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| 2. | Her navigation equipment included wireless direction finding and an echo sounding device.
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| 3. | By 1933 she carried wireless direction finding and echo sounding equipment.
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| 4. | Her navigation equipment included wireless direction finding, an echo sounding device and a gyrocompass.
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| 5. | Her navigation equipment included wireless direction finding, and echo sounding device and a gyrocompass.
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| 6. | In modern times, echo sounding is used for measuring the seabed in the open sea.
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| 7. | His second collection of poems " Echo Soundings " was published by Shoestring Press in 2012.
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| 8. | Despite many difficulties, testing of both echo sounding and radio acoustic ranging wrapped up successfully in November 1923.
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| 9. | Both echo sounding and radio acoustic ranging required a precise understanding of the speed of sound through water.
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| 10. | The term lives on in today's world in echo sounding, the technique of using sonar to measure depth.
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