1). Some of the first recorded measurements of bathymetry were made by the British explorer Sir James Clark Ross in 1840, by the U.S. Coast Survey beginning in 1845 with systematic studies of the Gulf Stream, and by the U.S. Navy, under the guidance of Matthew Fontaine Maury, beginning in 1849.

How were early bathymetric measurements or soundings made?

The process of measuring the depths is known as bathymetry . These measurements were first made through soundings , where a weighted line (lead line) was let out by hand until it touched the bottom, and the depth could be recorded from the length of the line (Figure 1.4. 1).

What invention from WWI led to great advancements in bathymetry?

Using Sonar. The first modern breakthrough in sea floor mapping came with the use of underwater sound projectors, called “sonar”, which was first used in World War I.