Depth sounding

Depth sounding

Depth sounding refers to a historical nautical term for measuring depth; it is often referred to simply as sounding. Sounding is finding the depth of a given point in a body of water. Sounding data is used in bathymetry to make maps of the floor of a body of water.[1] Soundings were traditionally given on nautical charts in fathoms. The National Oceanographic and Atmospheric Administration (NOAA), the agency responsible for bathymetric data in the United States still uses feet on charts, but metres have become the international standard for measuring depth. Sounding was originally done by hand with sounding poles or a weighted sounding line for greater depths.

Sometimes soundings were taken to establish position, a navigation function then, rather than safety alone. Soundings of this type were usually taken using tallow coated leads with a big wad of tallow in the bottom concavity. The tallow would bring up part of the bottom sediment (sand, pebbles, clay, shells, etc.) and allow the ship's officers to better estimate their position.

Traditional terms for soundings are a source for several important common expressions in the English language, notably "deep six" (a sounding of 6 fathoms) and Mark Twain (from "by the mark, twain", for a 2 fathoms). The term lives on in today's world in echo sounding, the technique of using sonar to measure depth. See Fishfinder (fathometer).

References


Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • Depth finder — A depth finder could mean any of the following: Sonar: use of underwater sound propagation to measure depth Fathometer or fishfinder: a device to locate fish at various water depths Echo sounding: a technique using sound pulses to measure depth… …   Wikipedia

  • sounding — Synonyms and related words: bathometry, bathymetry, booming, chiming, depth sounding, dinging, droning, echo sounding, echoic, echoing, echolocation, fathomage, fathoming, growling, jingling, lingering, monotone, monotonic, oceanography, pealing …   Moby Thesaurus

  • depth —   Hohonu.    ♦ Depth sounding, ana i ka hohonu …   English-Hawaiian dictionary

  • Sounding — Sound ing, n. 1. The act of one who, or that which, sounds (in any of the senses of the several verbs). [1913 Webster] 2. (Naut.) [From {Sound} to fathom.] (a) measurement by sounding; also, the depth so ascertained. (b) Any place or part of the… …   The Collaborative International Dictionary of English

  • Sounding lead — Sounding Sound ing, n. 1. The act of one who, or that which, sounds (in any of the senses of the several verbs). [1913 Webster] 2. (Naut.) [From {Sound} to fathom.] (a) measurement by sounding; also, the depth so ascertained. (b) Any place or… …   The Collaborative International Dictionary of English

  • Sounding line — Sounding Sound ing, n. 1. The act of one who, or that which, sounds (in any of the senses of the several verbs). [1913 Webster] 2. (Naut.) [From {Sound} to fathom.] (a) measurement by sounding; also, the depth so ascertained. (b) Any place or… …   The Collaborative International Dictionary of English

  • Sounding post — Sounding Sound ing, n. 1. The act of one who, or that which, sounds (in any of the senses of the several verbs). [1913 Webster] 2. (Naut.) [From {Sound} to fathom.] (a) measurement by sounding; also, the depth so ascertained. (b) Any place or… …   The Collaborative International Dictionary of English

  • Sounding rod — Sounding Sound ing, n. 1. The act of one who, or that which, sounds (in any of the senses of the several verbs). [1913 Webster] 2. (Naut.) [From {Sound} to fathom.] (a) measurement by sounding; also, the depth so ascertained. (b) Any place or… …   The Collaborative International Dictionary of English

  • sounding — sounding1 [soun′diŋ] adj. 1. making or giving forth sound 2. resonant; sonorous 3. high sounding; bombastic sounding2 [soun′diŋ] n. 1. a) the act of measuring the depth or examining the bottom of a body of water, etc. with or as with …   English World dictionary

  • Sounding — can refer to:*Determination of the depth of water usually in the sea. Originally using a weighted line called a lead line, more recently using **Echo sounding *Whale sounding, the act of diving by whales *an atmospheric sounding *various methods… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”