What is Sounding line?
[[File:Mesure du fond avec la sonde sur une frégate-Morel Fatio-img 3163.jpg|thumb|Measuring the water depth on a [[frigate]], illustration of 1844.]] A '''sounding line''' is a way to measure the depth, usually inside a body of [[water]]. The basic concept is that of a [[weight]] attached to a long [[rope]]. [[Category:Technology]]