| 1 | A trademark used for a sonic depth finder. | |
| 2 | Measurement of the depth of large bodies of water. | |
| 3 | And seek not the depths of your knowledge with staff or sounding line. | |
| 4 | So was Born the echo-sounding apparatus, now in general use in ships. | |
| 5 | And seek not the depths of your knowledge with staff or sounding line. |
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