In the event the wire (set at a specific depth by a procedure of weights and buoys) encountered an obstruction, it could come to be taut and variety a "V," revealing the depth and posture of submerged rocks and other obstructions. Echosounders grew to become preferred inside the 1930s and https://charlieepekp.bloggerswise.com/39585564/a-secret-weapon-for-hydrographic-survey